spotters: most-active-in sort with country/region selector, collection tracking (seen marks, progress, filters), refresh scripts score activity and report new NL entries

2026-10-25 13:24:37 +00:00
parent 3f294df337
commit 253cd69424
58 changed files with 2151 additions and 72 deletions
--- a/scripts/cars-refresh.sh
+++ b/scripts/cars-refresh.sh
@@ -1,14 +1,18 @@
 #!/usr/bin/env bash
-# Weekly-ish refresh of the car pokedex (/trackers/cars) on stan-vm.
+# Weekly-ish refresh of the car pokedex (/trackers/cars) on stan-ovh.
 #
-#   ssh stan-vm 'cd ~/dev/website-cars && git fetch -q && git checkout -q --detach origin/main \
+#   ssh stan@37.187.157.191 'cd ~/dev/website-cars && git fetch -q && git checkout -q --detach origin/main \
 #     && bun install --frozen-lockfile >/dev/null && scripts/cars-refresh.sh'
 #
 # 1. bun scripts/cars-import.ts --report-new   rebuilds brands/models/variants from RDW +
 #    fueleconomy.gov and notes which brands/models did not exist before.
 # 2. bun scripts/cars-photos.ts --missing       finds Wikimedia Commons photos for models
 #    that have none yet (new ones included).
-# stdout: one JSON report {generatedAt, totals, newBrands, newModels[] (with photo)}.
+# 3. bun scripts/spotters-activity.ts cars   refreshes the per-country activity scores
+#    ("most active in NL" sort; see that script).
+# stdout: one JSON report {generatedAt, totals, newBrands, newModels[] (with photo)}, plus `nl` per new
+# entry and `newInNl` (new entries that are active in the Netherlands, see
+# scripts/spotters-report-nl.ts). --report-new is accepted (the report is always printed).
 # Progress goes to stderr. DB_URL is read from the running app container and never printed.
 set -euo pipefail
 cd "$(dirname "$0")/.."
@@ -19,8 +23,12 @@ if [ -z "${DB_URL:-}" ]; then
 	export DB_URL
 fi

+args=()
+for a in "$@"; do [ "$a" = "--report-new" ] || args+=("$a"); done
+
 report=$(mktemp /tmp/cars-report.XXXXXX.json)
 trap 'rm -f "$report"' EXIT

-bun scripts/cars-import.ts --report-new "$@" >"$report"
-bun scripts/cars-photos.ts --missing --enrich "$report" --fetch
+bun scripts/cars-import.ts --report-new "${args[@]}" >"$report"
+bun scripts/spotters-activity.ts cars >&2
+bun scripts/cars-photos.ts --missing --enrich "$report" --fetch | bun scripts/spotters-report-nl.ts cars
--- a/scripts/planes-refresh.sh
+++ b/scripts/planes-refresh.sh
@@ -9,7 +9,11 @@
 #    are stable (types are matched by Wikidata id).
 # 2. bun scripts/planes-photos.ts --missing       finds Wikimedia Commons photos for types that
 #    have none yet (new ones included) and maker logos that are missing.
-# stdout: one JSON report {generatedAt, totals, newMakers, newTypes[] (with photo)}.
+# 3. bun scripts/spotters-activity.ts planes   refreshes the per-country activity scores
+#    ("most active in NL" sort; OpenSky registrations, see that script).
+# stdout: one JSON report {generatedAt, totals, newMakers, newTypes[] (with photo)}, plus `nl` per new
+# entry and `newInNl` (new entries that are active in the Netherlands, see
+# scripts/spotters-report-nl.ts). --report-new is accepted (the report is always printed).
 # Progress goes to stderr. DB_URL is read from the running app container and never printed.
 set -euo pipefail
 cd "$(dirname "$0")/.."
@@ -20,8 +24,12 @@ if [ -z "${DB_URL:-}" ]; then
 	export DB_URL
 fi

+args=()
+for a in "$@"; do [ "$a" = "--report-new" ] || args+=("$a"); done
+
 report=$(mktemp /tmp/planes-report.XXXXXX.json)
 trap 'rm -f "$report"' EXIT

-bun scripts/planes-import.ts --report-new "$@" >"$report"
-bun scripts/planes-photos.ts --missing --enrich "$report" --fetch
+bun scripts/planes-import.ts --report-new "${args[@]}" >"$report"
+bun scripts/spotters-activity.ts planes >&2
+bun scripts/planes-photos.ts --missing --enrich "$report" --fetch | bun scripts/spotters-report-nl.ts planes
--- a/scripts/spotters-activity.ts
+++ b/scripts/spotters-activity.ts
@@ -0,0 +1,397 @@
+// Precomputes "how active is this entry in country X" for the four spotting pokedexes
+// (/trackers/cars, planes, trains, wildlife) into <schema>.activity (item, area, score),
+// so the dex can sort by most active in NL / Germany / Europe ... with one indexed join.
+//
+//   DB_URL=... bun scripts/spotters-activity.ts <cars|planes|trains|wildlife|all> [--dry-run]
+//
+// Scores are only comparable within one area (higher = more active there):
+//  - cars:     NL = cars registered in NL (RDW). US = EPA-tested model years and variants.
+//              The brand's home country = overall popularity (NL regs + 100 x US variants).
+//              Other countries have no registration data (gap).
+//  - planes:   aircraft registered per country with that type (OpenSky aircraft database,
+//              matched by maker + model name, then by ICAO type code), plus 25 per
+//              operator from that country on Wikidata (P137 -> P17; air forces, airlines).
+//              Variants roll up into their family.
+//  - trains:   100 if an operator from that country runs it (+25 per extra operator), +300
+//              if still in service (+100 unknown), 20 for the country of origin only, small
+//              tie-break for number built.
+//  - wildlife: research-grade iNaturalist observations per country (same query as the NL
+//              count in scripts/wildlife-import.ts); Europe / world use the stored counts.
+// Regions (src/lib/spotting/areas.ts) are the sum of their countries; `world` = all.
+// External calls: OpenSky CSV (1 download), Wikidata SPARQL (~10 queries) and the
+// iNaturalist API (~1 call/s, ~450 calls). Progress on stderr.
+import postgres from 'postgres';
+import { existsSync } from 'node:fs';
+import { REGIONS, COUNTRIES } from '../src/lib/spotting/areas';
+import { countryCode } from './spotters-countries';
+import { chunks, log, sparql } from './planes-wiki';
+import { inat } from './wildlife-inat';
+
+type Scores = Map<number, Map<string, number>>;
+const args = process.argv.slice(2);
+const which = args.find((a) => !a.startsWith('--')) ?? 'all';
+const dryRun = args.includes('--dry-run');
+const flag = (name: string) => {
+	const i = args.indexOf(name);
+	return i >= 0 ? args[i + 1] : undefined;
+};
+
+const url = process.env.DB_URL;
+if (!url) throw new Error('Set DB_URL');
+const sql = postgres(url, { max: 2, connect_timeout: 10, onnotice: () => {} });
+
+function add(scores: Scores, id: number, area: string | null, value: number) {
+	if (!area || !(value > 0)) return;
+	let m = scores.get(id);
+	if (!m) scores.set(id, (m = new Map()));
+	m.set(area, (m.get(area) ?? 0) + value);
+}
+
+/** Adds region rows (sum of countries) unless already present, then replaces the table. */
+async function write(schema: string, column: string, scores: Scores, keepRegions = false) {
+	const rows: { id: number; area: string; score: number }[] = [];
+	for (const [id, m] of scores) {
+		const out = new Map(m);
+		for (const r of REGIONS) {
+			if (keepRegions && m.has(r.code)) continue;
+			let sum = 0;
+			for (const [area, v] of m)
+				if (/^[a-z]{2}$/.test(area) && (r.code === 'world' || r.countries.includes(area))) sum += v;
+			if (sum > 0) out.set(r.code, sum);
+		}
+		for (const [area, score] of out) rows.push({ id, area, score: Math.round(score * 100) / 100 });
+	}
+	const areas = new Map<string, number>();
+	for (const r of rows) areas.set(r.area, (areas.get(r.area) ?? 0) + 1);
+	log(
+		`${schema}: ${rows.length} activity rows for ${scores.size} entries; nl ${areas.get('nl') ?? 0}, de ${areas.get('de') ?? 0}, us ${areas.get('us') ?? 0}, europe ${areas.get('europe') ?? 0}, ${areas.size} areas`
+	);
+	if (dryRun) return;
+	await sql.begin(async (tx) => {
+		await tx.unsafe(`delete from ${schema}.activity`);
+		for (const c of chunks(rows, 5000))
+			await tx.unsafe(
+				`insert into ${schema}.activity (${column}, area, score)
+				 select * from unnest($1::int[], $2::text[], $3::real[])`,
+				[c.map((r) => r.id), c.map((r) => r.area), c.map((r) => r.score)] as never
+			);
+	});
+}
+
+// ------------------------------------------------------------------ cars
+
+async function cars() {
+	const models = await sql<
+		{ id: number; nl: number; variants: number; years: number; country: string | null }[]
+	>`select m.id, m.nl_count as nl, m.variant_count as variants,
+		coalesce(cardinality(m.us_years), 0) as years, b.country
+		from cars.models m join cars.brands b on b.id = m.brand_id`;
+	const scores: Scores = new Map();
+	for (const m of models) {
+		add(scores, m.id, 'nl', m.nl);
+		add(scores, m.id, 'us', m.years * 10 + m.variants);
+		const home = countryCode(m.country);
+		if (home && home !== 'nl' && home !== 'us')
+			add(scores, m.id, home, 1 + m.nl + 100 * m.variants);
+	}
+	await write('cars', 'model_id', scores);
+}
+
+// ------------------------------------------------------------------ trains
+
+async function trains() {
+	const types = await sql<
+		{
+			id: number;
+			country: string | null;
+			built: number | null;
+			in_service: boolean | null;
+			retired: number | null;
+			ops: (string | null)[];
+		}[]
+	>`select t.id, t.country, t.number_built as built, t.in_service, t.retired_year as retired,
+		coalesce(array_agg(o.country) filter (where o.id is not null), '{}') as ops
+		from trains.types t
+		left join trains.type_operators x on x.type_id = t.id
+		left join trains.operators o on o.id = x.operator_id
+		group by t.id`;
+	const scores: Scores = new Map();
+	for (const t of types) {
+		// Running there now matters most ("does it run on Dutch rails?"): in service +300,
+		// unknown status +100, retired +0 (+50 if retired after 2000).
+		const tie = Math.min(t.built ?? 0, 1000) / 100;
+		const status =
+			t.in_service === true ? 300 : t.in_service == null ? 100 : (t.retired ?? 0) >= 2000 ? 50 : 0;
+		const opCountries = new Map<string, number>();
+		for (const name of t.ops) {
+			const cc = countryCode(name);
+			if (cc) opCountries.set(cc, (opCountries.get(cc) ?? 0) + 1);
+		}
+		for (const [cc, n] of opCountries)
+			add(scores, t.id, cc, 100 + 25 * (Math.min(n, 4) - 1) + status + tie);
+		const origin = countryCode(t.country);
+		if (origin && !opCountries.has(origin)) add(scores, t.id, origin, 20 + tie);
+	}
+	await write('trains', 'type_id', scores);
+}
+
+// ------------------------------------------------------------------ planes
+
+/** Minimal CSV reader for OpenSky's single-quoted dump ('' escapes a quote). */
+function* csvRows(text: string, quote = "'") {
+	let row: string[] = [];
+	let field = '';
+	let inQ = false;
+	for (let i = 0; i < text.length; i++) {
+		const ch = text[i];
+		if (inQ) {
+			if (ch === quote) {
+				if (text[i + 1] === quote) {
+					field += quote;
+					i++;
+				} else inQ = false;
+			} else field += ch;
+		} else if (ch === quote) inQ = true;
+		else if (ch === ',') {
+			row.push(field);
+			field = '';
+		} else if (ch === '\n') {
+			row.push(field);
+			yield row;
+			row = [];
+			field = '';
+		} else if (ch !== '\r') field += ch;
+	}
+	if (field || row.length) yield [...row, field];
+}
+
+const norm = (s: string) =>
+	s
+		.toLowerCase()
+		.normalize('NFD')
+		.replace(/[\u0300-\u036f]/g, '')
+		.replace(/[^a-z0-9]+/g, ' ')
+		.trim();
+const GENERIC = /\b(family|series|aircraft|airliner|helicopter|classic|next generation)\b/g;
+
+async function planes() {
+	const csvPath = flag('--opensky') ?? '/tmp/spotters/opensky.csv';
+	if (!existsSync(csvPath)) {
+		log(`planes: downloading the OpenSky aircraft database to ${csvPath}`);
+		const res = await fetch(
+			'https://s3.opensky-network.org/data-samples/metadata/aircraft-database-complete-2025-08.csv'
+		);
+		if (!res.ok) throw new Error(`OpenSky download: HTTP ${res.status}`);
+		await Bun.write(csvPath, await res.arrayBuffer());
+	}
+	const types = await sql<
+		{
+			id: number;
+			family: number | null;
+			name: string;
+			maker: string;
+			makers: string[];
+			icao: string[];
+			wikidata: string;
+		}[]
+	>`select t.id, t.family_id as family, t.name, m.name as maker, t.makers, t.icao, t.wikidata
+		from planes.types t join planes.makers m on m.id = t.maker_id`;
+
+	// Candidate keys per maker word: the type's name, without generic words, and its
+	// leading code part ("PA-28 Cherokee" -> "pa 28", "F-16 Fighting Falcon" -> "f 16").
+	type Cand = { id: number; key: string; exact: boolean; family: number | null };
+	const byMakerWord = new Map<string, Cand[]>();
+	for (const t of types) {
+		const keys = new Set<string>();
+		const n = norm(t.name);
+		keys.add(n);
+		keys.add(n.replace(GENERIC, ' ').replace(/\s+/g, ' ').trim());
+		const toks = n.split(' ');
+		const codeEnd = toks.findIndex((w, i) => i > 0 && /^[a-z]{3,}$/.test(w));
+		if (codeEnd > 0 && toks.slice(0, codeEnd).some((w) => /\d/.test(w)))
+			keys.add(toks.slice(0, codeEnd).join(' '));
+		const words = new Set([t.maker, ...t.makers].map((m) => norm(m).split(' ')[0]).filter(Boolean));
+		for (const key of keys) {
+			if (key.length < 2 || (!/\d/.test(key) && key.length < 4)) continue;
+			for (const w of words) {
+				if (!byMakerWord.has(w)) byMakerWord.set(w, []);
+				byMakerWord.get(w)!.push({ id: t.id, key, exact: key === n, family: t.family });
+			}
+		}
+	}
+	const matchModel = (manufacturer: string, model: string): number | null => {
+		const cands = byMakerWord.get(norm(manufacturer).split(' ')[0]);
+		if (!cands) return null;
+		const m = norm(model);
+		let best: Cand | null = null;
+		for (const c of cands) {
+			if (!(m === c.key || (m.startsWith(c.key) && !/\d/.test(m[c.key.length] ?? '')))) continue;
+			if (
+				!best ||
+				c.key.length > best.key.length ||
+				(c.key.length === best.key.length && best.family !== null && c.family === null)
+			)
+				best = c;
+		}
+		return best?.id ?? null;
+	};
+
+	log('planes: reading OpenSky aircraft');
+	const text = await Bun.file(csvPath).text();
+	const rows = csvRows(text);
+	const head = rows.next().value as string[];
+	const col = (n: string) => head.indexOf(n);
+	const [iCountry, iMan, iModel, iType] = [
+		col('country'),
+		col('manufacturerName'),
+		col('model'),
+		col('typecode')
+	];
+	const direct = new Map<string, Map<string, number>>(); // "id" -> country -> n
+	const byCode = new Map<string, Map<string, number>>(); // typecode -> country -> n (unmatched)
+	const codeVotes = new Map<string, Map<number, number>>(); // typecode -> type id -> votes
+	let total = 0;
+	let matched = 0;
+	for (const r of rows) {
+		if (r.length < head.length) continue;
+		const cc = countryCode(r[iCountry]);
+		if (!cc) continue;
+		total++;
+		const code = r[iType]?.trim().toUpperCase();
+		const id = r[iMan] && r[iModel] ? matchModel(r[iMan], r[iModel]) : null;
+		if (id) {
+			matched++;
+			const key = String(id);
+			if (!direct.has(key)) direct.set(key, new Map());
+			direct.get(key)!.set(cc, (direct.get(key)!.get(cc) ?? 0) + 1);
+			if (code) {
+				if (!codeVotes.has(code)) codeVotes.set(code, new Map());
+				codeVotes.get(code)!.set(id, (codeVotes.get(code)!.get(id) ?? 0) + 1);
+			}
+		} else if (code) {
+			if (!byCode.has(code)) byCode.set(code, new Map());
+			byCode.get(code)!.set(cc, (byCode.get(code)!.get(cc) ?? 0) + 1);
+		}
+	}
+	// Unmatched aircraft follow their ICAO type code: the type's own ICAO list first, else
+	// the type most matched aircraft with that code went to (needs a clear majority).
+	const icaoOwner = new Map<string, number>();
+	for (const t of types) for (const c of t.icao) if (!icaoOwner.has(c)) icaoOwner.set(c, t.id);
+	let viaCode = 0;
+	for (const [code, counts] of byCode) {
+		let owner = icaoOwner.get(code) ?? null;
+		const votes = codeVotes.get(code);
+		if (!owner && votes) {
+			const sorted = [...votes].sort((a, b) => b[1] - a[1]);
+			const sum = sorted.reduce((s, [, n]) => s + n, 0);
+			if (sorted[0][1] >= 3 && sorted[0][1] / sum >= 0.6) owner = sorted[0][0];
+		}
+		if (!owner) continue;
+		const key = String(owner);
+		if (!direct.has(key)) direct.set(key, new Map());
+		for (const [cc, n] of counts) {
+			direct.get(key)!.set(cc, (direct.get(key)!.get(cc) ?? 0) + n);
+			viaCode += n;
+		}
+	}
+	log(
+		`planes: ${total} aircraft with a country, ${matched} matched by model, ${viaCode} by type code`
+	);
+
+	const scores: Scores = new Map();
+	// Roll registrations up the family tree (737 MAX 8 -> 737 MAX -> 737).
+	const parent = new Map(types.map((t) => [t.id, t.family]));
+	for (const [key, m] of direct) {
+		let id: number | null = Number(key);
+		for (let depth = 0; id && depth < 6; depth++, id = parent.get(id) ?? null)
+			for (const [cc, n] of m) add(scores, id, cc, n);
+	}
+	// Wikidata operators (P137) and their countries.
+	const byQid = new Map(types.map((t) => [t.wikidata, t.id]));
+	let ops = 0;
+	let failed = 0;
+	for (const c of chunks(
+		[...byQid.keys()].filter((q): q is string => !!q),
+		100
+	)) {
+		// A failing chunk (query timeout) only loses its operator bonus; registrations stay.
+		const res = await sparql<{ item: string; iso: string; n: string }>(`
+			SELECT ?item ?iso (COUNT(DISTINCT ?op) AS ?n) WHERE {
+				VALUES ?item { ${c.map((q) => `wd:${q}`).join(' ')} }
+				?item wdt:P137 ?op . ?op wdt:P17 ?country . ?country wdt:P297 ?iso .
+			} GROUP BY ?item ?iso`).catch((e: unknown) => {
+			failed++;
+			log(`planes: operator chunk failed (${String(e).slice(0, 80)})`);
+			return [];
+		});
+		for (const r of res) {
+			const id = byQid.get(r.item.split('/').at(-1)!);
+			if (!id) continue;
+			add(scores, id, r.iso.toLowerCase(), 25 * Math.min(Number(r.n) || 1, 6));
+			ops++;
+		}
+	}
+	log(`planes: ${ops} type x country operator links from Wikidata (${failed} chunks failed)`);
+	await write('planes', 'type_id', scores);
+}
+
+// ------------------------------------------------------------------ wildlife
+
+async function wildlife() {
+	const species = await sql<{ id: number; inat: number; nl: number; eu: number; world: number }[]>`
+		select id, inat_id as inat, nl_obs as nl, europe_obs as eu, world_obs as world from wildlife.species`;
+	const scores: Scores = new Map();
+	for (const s of species) {
+		add(scores, s.id, 'nl', s.nl);
+		add(scores, s.id, 'europe', s.eu);
+		add(scores, s.id, 'world', s.world);
+	}
+	const byInat = new Map(species.map((s) => [s.inat, s.id]));
+	const countries = [...new Set([...COUNTRIES, 'lu'])].filter((c) => c !== 'nl');
+	const dn = new Intl.DisplayNames(['en'], { type: 'region' });
+	for (const cc of countries) {
+		const name =
+			{
+				us: 'United States',
+				gb: 'United Kingdom',
+				cz: 'Czech Republic',
+				tr: 'Turkey',
+				kr: 'South Korea'
+			}[cc] ?? dn.of(cc.toUpperCase())!;
+		const found = await inat<{
+			results: { id: number; name: string; admin_level: number | null }[];
+		}>(`/places/autocomplete?q=${encodeURIComponent(name)}&per_page=20`);
+		const place =
+			found.results.find((p) => p.admin_level === 0 && norm(p.name) === norm(name)) ??
+			found.results.find((p) => p.admin_level === 0);
+		if (!place) {
+			log(`wildlife: no iNaturalist place for ${cc} (${name})`);
+			continue;
+		}
+		let n = 0;
+		for (const batch of chunks([...byInat.keys()], 400)) {
+			const res = await inat(
+				`/observations/species_counts?place_id=${place.id}&taxon_id=${batch.join(',')}&captive=false&quality_grade=research&per_page=500`
+			);
+			for (const r of res.results) {
+				const id = byInat.get(r.taxon.id);
+				if (id && r.count > 0) {
+					add(scores, id, cc, r.count);
+					n++;
+				}
+			}
+		}
+		log(`wildlife: ${cc} (${place.name}, place ${place.id}): ${n} species`);
+	}
+	await write('wildlife', 'species_id', scores, true);
+}
+
+const jobs: Record<string, () => Promise<void>> = { cars, trains, planes, wildlife };
+try {
+	for (const name of which === 'all' ? Object.keys(jobs) : which.split(',')) {
+		if (!jobs[name]) throw new Error(`unknown tracker ${name}`);
+		await jobs[name]();
+	}
+} finally {
+	await sql.end();
+}
--- a/scripts/spotters-countries.ts
+++ b/scripts/spotters-countries.ts
@@ -0,0 +1,172 @@
+// Country name (as found in Wikidata labels, OpenSky, the train/plane/car data) -> lowercase
+// ISO 3166-1 alpha-2 code, for scripts/spotters-activity.ts. Historic states map to their
+// main successor (Deutsches Reich -> de, Soviet Union -> ru, Yugoslavia -> rs).
+
+const ALIASES: Record<string, string> = {
+	'united states of america': 'us',
+	usa: 'us',
+	'u.s.': 'us',
+	'united states': 'us',
+	"people's republic of china": 'cn',
+	'republic of china': 'tw',
+	'taiwan (republic of china)': 'tw',
+	'taiwan under japanese rule': 'tw',
+	manchukuo: 'cn',
+	'hong kong': 'hk',
+	macau: 'mo',
+	macao: 'mo',
+	'russian federation': 'ru',
+	'soviet union': 'ru',
+	ussr: 'ru',
+	'soviet union (russia since 1991)': 'ru',
+	'russian empire': 'ru',
+	'russian sfsr': 'ru',
+	'deutsches reich': 'de',
+	'german reich': 'de',
+	'german empire': 'de',
+	'nazi germany': 'de',
+	'east germany': 'de',
+	'west germany': 'de',
+	'weimar republic': 'de',
+	'weimarer republik': 'de',
+	'deutsches kaiserreich': 'de',
+	'allied-occupied germany': 'de',
+	'grand duchy of baden': 'de',
+	'territory of the saar basin': 'de',
+	'saar protectorate': 'de',
+	'kingdom of bavaria': 'de',
+	'kingdom of prussia': 'de',
+	'kingdom of saxony': 'de',
+	'kingdom of württemberg': 'de',
+	'german reich (nazi period) deutsches reich': 'de',
+	germa: 'de',
+	czechoslovakia: 'cz',
+	'first czechoslovak republic': 'cz',
+	'czech republic': 'cz',
+	'protectorate of bohemia and moravia': 'cz',
+	'czechoslovak socialist republic': 'cz',
+	'korea under japanese rule': 'kr',
+	'korean empire': 'kr',
+	'south korea': 'kr',
+	'north korea': 'kp',
+	'republic of korea': 'kr',
+	"democratic people's republic of korea": 'kp',
+	'irish free state': 'ie',
+	'republic of ireland': 'ie',
+	yugoslavia: 'rs',
+	'kingdom of yugoslavia': 'rs',
+	'socialist federal republic of yugoslavia': 'rs',
+	'federal republic of yugoslavia': 'rs',
+	'serbia and montenegro': 'rs',
+	'empire of japan': 'jp',
+	'kingdom of italy': 'it',
+	'austria–hungary': 'at',
+	'austria-hungary': 'at',
+	cisleithania: 'at',
+	'first republic of austria': 'at',
+	'austrian empire': 'at',
+	'colony of natal': 'za',
+	'south african republic': 'za',
+	'orange free state': 'za',
+	'cape colony': 'za',
+	'union of south africa': 'za',
+	'dutch east indies': 'id',
+	'kingdom of the netherlands': 'nl',
+	netherlands: 'nl',
+	holland: 'nl',
+	england: 'gb',
+	scotland: 'gb',
+	wales: 'gb',
+	'northern ireland': 'gb',
+	'great britain': 'gb',
+	'united kingdom of great britain and ireland': 'gb',
+	'united kingdom': 'gb',
+	uk: 'gb',
+	tanganyika: 'tz',
+	'mandatory palestine': 'il',
+	'second polish republic': 'pl',
+	"polish people's republic": 'pl',
+	'polska rzeczpospolita ludowa': 'pl',
+	'second spanish republic': 'es',
+	'francoist spain': 'es',
+	'kingdom of romania': 'ro',
+	"ukrainian people's republic": 'ua',
+	'ukrainian ssr': 'ua',
+	turkey: 'tr',
+	türkiye: 'tr',
+	'ottoman empire': 'tr',
+	'kingdom of hungary': 'hu',
+	'kingdom of greece': 'gr',
+	'kingdom of bulgaria': 'bg',
+	'british raj': 'in',
+	'dominion of india': 'in',
+	ceylon: 'lk',
+	burma: 'mm',
+	'french third republic': 'fr',
+	'vichy france': 'fr',
+	'french fourth republic': 'fr',
+	'kingdom of egypt': 'eg',
+	rhodesia: 'zw',
+	'southern rhodesia': 'zw',
+	'northern rhodesia': 'zm',
+	'belgian congo': 'cd',
+	zaire: 'cd',
+	swaziland: 'sz',
+	eswatini: 'sz',
+	persia: 'ir',
+	iran: 'ir',
+	syria: 'sy',
+	vietnam: 'vn',
+	laos: 'la',
+	bolivia: 'bo',
+	venezuela: 've',
+	tanzania: 'tz',
+	moldova: 'md',
+	macedonia: 'mk',
+	'north macedonia': 'mk',
+	'bosnia and herzegovina': 'ba',
+	'ivory coast': 'ci',
+	"côte d'ivoire": 'ci',
+	'cape verde': 'cv',
+	'east timor': 'tl',
+	kosovo: 'xk',
+	'isle of man': 'im',
+	jersey: 'je',
+	guernsey: 'gg',
+	'state of palestine': 'ps',
+	brunei: 'bn',
+	'republic of the congo': 'cg',
+	'democratic republic of the congo': 'cd',
+	'the gambia': 'gm',
+	'the bahamas': 'bs',
+	'federated states of micronesia': 'fm',
+	'vatican city': 'va',
+	czechia: 'cz'
+};
+
+let byName: Map<string, string> | null = null;
+
+function table() {
+	if (byName) return byName;
+	byName = new Map();
+	const dn = new Intl.DisplayNames(['en'], { type: 'region' });
+	for (let a = 65; a <= 90; a++)
+		for (let b = 65; b <= 90; b++) {
+			const code = String.fromCharCode(a, b);
+			try {
+				const name = dn.of(code);
+				if (name && name !== code) byName.set(name.toLowerCase(), code.toLowerCase());
+			} catch {
+				/* not a region */
+			}
+		}
+	for (const [k, v] of Object.entries(ALIASES)) byName.set(k, v);
+	return byName;
+}
+
+/** Country label -> ISO2 (lowercase), or null when unknown / multinational. */
+export function countryCode(name: string | null | undefined): string | null {
+	if (!name) return null;
+	const key = name.trim().toLowerCase().replace(/\s+/g, ' ');
+	return table().get(key) ?? table().get(key.replace(/^the /, '')) ?? null;
+}
--- a/scripts/spotters-report-nl.ts
+++ b/scripts/spotters-report-nl.ts
@@ -0,0 +1,56 @@
+// Adds Netherlands relevance to a refresh report (stdin JSON -> stdout JSON), so a "new
+// entries" ping can be limited to things that actually show up in NL.
+//
+//   bun scripts/cars-import.ts --report-new | bun scripts/spotters-report-nl.ts cars
+//
+// Every new item (newModels / newTypes / newSpecies, matched by the /trackers/... url) gets
+// `nl` (its activity score in NL from <schema>.activity, 0 when none) and the report gets
+// `newInNl`: the same items with nl > 0, most active first. Needs DB_URL. Run after
+// scripts/spotters-activity.ts so new entries already have scores.
+import postgres from 'postgres';
+
+const tracker = process.argv[2];
+const CFG = {
+	cars: {
+		key: 'newModels',
+		sql: "select a.score from cars.activity a join cars.models m on m.id = a.model_id join cars.brands b on b.id = m.brand_id where a.area = 'nl' and b.slug = $1 and m.slug = $2"
+	},
+	planes: {
+		key: 'newTypes',
+		sql: "select a.score from planes.activity a join planes.types t on t.id = a.type_id join planes.makers m on m.id = t.maker_id where a.area = 'nl' and m.slug = $1 and t.slug = $2"
+	},
+	trains: {
+		key: 'newTypes',
+		sql: "select a.score from trains.activity a join trains.types t on t.id = a.type_id join trains.makers m on m.id = t.maker_id where a.area = 'nl' and m.slug = $1 and t.slug = $2"
+	},
+	wildlife: {
+		key: 'newSpecies',
+		sql: "select a.score from wildlife.activity a join wildlife.species s on s.id = a.species_id join wildlife.groups g on g.id = s.group_id where a.area = 'nl' and g.slug = $1 and s.slug = $2"
+	}
+} as const;
+if (!(tracker in CFG)) {
+	console.error(
+		'usage: bun scripts/spotters-report-nl.ts <cars|planes|trains|wildlife> < report.json'
+	);
+	process.exit(2);
+}
+const cfg = CFG[tracker as keyof typeof CFG];
+const input = await new Response(Bun.stdin.stream()).text();
+if (!input.trim()) process.exit(0);
+const report = JSON.parse(input) as Record<string, unknown>;
+const items = (report[cfg.key] ?? []) as { url?: string; nl?: number }[];
+const sql = postgres(process.env.DB_URL!, { max: 1 });
+try {
+	for (const item of items) {
+		const path = item.url ? new URL(item.url, 'https://x').pathname : '';
+		const [a, b] = path.replace(/^\/trackers\/[a-z]+\//, '').split('/');
+		const [row] = a && b ? await sql.unsafe<{ score: number }[]>(cfg.sql, [a, b]) : [];
+		item.nl = row ? Math.round(row.score * 10) / 10 : 0;
+	}
+	report.newInNl = items
+		.filter((x) => (x.nl ?? 0) > 0)
+		.toSorted((x, y) => (y.nl ?? 0) - (x.nl ?? 0));
+} finally {
+	await sql.end();
+}
+console.log(JSON.stringify(report, null, 1));
--- a/scripts/trains-refresh.sh
+++ b/scripts/trains-refresh.sh
@@ -9,7 +9,11 @@
 #    are stable (types are matched by Wikidata id).
 # 2. bun scripts/trains-photos.ts --missing       finds Wikimedia Commons photos for types that
 #    have none yet (new ones included) and maker and operator logos that are missing.
-# stdout: one JSON report {generatedAt, totals, newMakers, newTypes[] (with photo)}.
+# 3. bun scripts/spotters-activity.ts trains   refreshes the per-country activity scores
+#    ("most active in NL" sort; see that script).
+# stdout: one JSON report {generatedAt, totals, newMakers, newTypes[] (with photo)}, plus `nl` per new
+# entry and `newInNl` (new entries that are active in the Netherlands, see
+# scripts/spotters-report-nl.ts). --report-new is accepted (the report is always printed).
 # Progress goes to stderr. DB_URL is read from the running app container and never printed.
 set -euo pipefail
 cd "$(dirname "$0")/.."
@@ -20,8 +24,12 @@ if [ -z "${DB_URL:-}" ]; then
 	export DB_URL
 fi

+args=()
+for a in "$@"; do [ "$a" = "--report-new" ] || args+=("$a"); done
+
 report=$(mktemp /tmp/trains-report.XXXXXX.json)
 trap 'rm -f "$report"' EXIT

-bun scripts/trains-import.ts --report-new "$@" >"$report"
-bun scripts/trains-photos.ts --missing --enrich "$report" --fetch
+bun scripts/trains-import.ts --report-new "${args[@]}" >"$report"
+bun scripts/spotters-activity.ts trains >&2
+bun scripts/trains-photos.ts --missing --enrich "$report" --fetch | bun scripts/spotters-report-nl.ts trains
--- a/scripts/wildlife-refresh.sh
+++ b/scripts/wildlife-refresh.sh
@@ -9,7 +9,10 @@
 #    that entered the lists (existing ones are kept, Dex numbers are stable).
 # 2. bun scripts/wildlife-photos.ts --missing   CC-licensed iNaturalist photos for species
 #    without photos (new ones included).
-# --report-new: stdout is one JSON report {generatedAt, totals, newSpecies[] (with photo)}.
+# 3. bun scripts/spotters-activity.ts wildlife   per-country activity scores (iNaturalist
+#    research-grade observations per country) for the "most active in …" sort.
+# --report-new: stdout is one JSON report {generatedAt, totals, newSpecies[] (with photo)},
+# plus `nl` per new species and `newInNl` (see scripts/spotters-report-nl.ts).
 # Without it, progress only. Progress goes to stderr. DB_URL is read from the running app
 # container and never printed.
 set -euo pipefail
@@ -26,8 +29,10 @@ if [ "${1:-}" = "--report-new" ]; then
 	report=$(mktemp /tmp/wildlife-report.XXXXXX.json)
 	trap 'rm -f "$report"' EXIT
 	bun scripts/wildlife-import.ts --report-new "$@" >"$report"
-	bun scripts/wildlife-photos.ts --missing --enrich "$report"
+	bun scripts/spotters-activity.ts wildlife >&2
+	bun scripts/wildlife-photos.ts --missing --enrich "$report" | bun scripts/spotters-report-nl.ts wildlife
 else
 	bun scripts/wildlife-import.ts "$@" >&2
 	bun scripts/wildlife-photos.ts --missing >&2
+	bun scripts/spotters-activity.ts wildlife >&2
 fi
--- a/src/lib/cars/BrandTile.svelte
+++ b/src/lib/cars/BrandTile.svelte
@@ -6,6 +6,7 @@
 </script>

 <a href="/trackers/cars/{brand.slug}" class={['tile', { compact }]} title={brand.name}>
+	{#if brand.seen}<span class="got" title="{brand.seen} collected">✓ {brand.seen}</span>{/if}
 	<span class="mark"><BrandBadge name={brand.name} logo={brand.logo} size="xl" /></span>
 	<span class="name">{brand.name}</span>
 	{#if !compact}
@@ -18,7 +19,20 @@
 </a>

 <style>
+	.got {
+		position: absolute;
+		top: 0.4rem;
+		right: 0.4rem;
+		z-index: 1;
+		border-radius: 999px;
+		padding: 0.05rem 0.4rem;
+		font-size: 0.68rem;
+		font-weight: 600;
+		color: #fff;
+		background: rgb(22 163 74);
+	}
 	.tile {
+		position: relative;
 		display: flex;
 		flex-direction: column;
 		align-items: center;
--- a/src/lib/cars/shared.ts
+++ b/src/lib/cars/shared.ts
@@ -24,6 +24,7 @@ export const BODIES = [
 ] as const;
 export const DRIVES = ['fwd', 'rwd', 'awd', '4wd'] as const;
 export const SORTS = {
+	active: 'most active in…',
 	popular: 'most common in NL',
 	dex: 'dex #',
 	name: 'name',
@@ -152,6 +153,8 @@ export const years = (first: number | null, last: number | null, current: number
 			: `${first}–${last >= current ? 'now' : last}`;

 export type CarCard = {
+	id: number;
+	seen: boolean;
 	dex: number;
 	slug: string;
 	name: string;
@@ -190,6 +193,8 @@ export type CarPhoto = {

 /** A brand in the logo grid (/trackers/cars/brands and the strip on /trackers/cars). */
 export type BrandTileData = {
+	/** Entries Stan has collected in this group (optional). */
+	seen?: number;
 	slug: string;
 	name: string;
 	models: number;
--- a/src/lib/planes/MakerTile.svelte
+++ b/src/lib/planes/MakerTile.svelte
@@ -6,6 +6,7 @@
 </script>

 <a href="/trackers/planes/{maker.slug}" class={['tile', { compact }]} title={maker.name}>
+	{#if maker.seen}<span class="got" title="{maker.seen} collected">✓ {maker.seen}</span>{/if}
 	<span class="mark"><BrandBadge name={maker.name} logo={maker.logo} size="xl" /></span>
 	<span class="name">{maker.name}</span>
 	{#if !compact}
@@ -18,7 +19,20 @@
 </a>

 <style>
+	.got {
+		position: absolute;
+		top: 0.4rem;
+		right: 0.4rem;
+		z-index: 1;
+		border-radius: 999px;
+		padding: 0.05rem 0.4rem;
+		font-size: 0.68rem;
+		font-weight: 600;
+		color: #fff;
+		background: rgb(22 163 74);
+	}
 	.tile {
+		position: relative;
 		display: flex;
 		flex-direction: column;
 		align-items: center;
--- a/src/lib/planes/shared.ts
+++ b/src/lib/planes/shared.ts
@@ -41,6 +41,7 @@ export const ERAS = {
 } as const;
 export type PlaneEra = keyof typeof ERAS;
 export const SORTS = {
+	active: 'most active in…',
 	built: 'most built',
 	dex: 'dex #',
 	name: 'name',
@@ -148,6 +149,8 @@ export const fmtKg = (kg: number) =>
 export const fmtM = (m: number) => `${m >= 100 ? Math.round(m) : Math.round(m * 10) / 10} m`;

 export type PlaneCard = {
+	id: number;
+	seen: boolean;
 	dex: number;
 	slug: string;
 	name: string;
@@ -170,6 +173,8 @@ export type PlaneCard = {
 };

 export type MakerTileData = {
+	/** Entries Stan has collected in this group (optional). */
+	seen?: number;
 	slug: string;
 	name: string;
 	types: number;
--- a/src/lib/server/cars.ts
+++ b/src/lib/server/cars.ts
@@ -4,6 +4,8 @@ import { db } from '#lib/server/db/index.js';
 import { carBrands, carModels, carPhotos, carVariants } from '#lib/server/db/schema/index.js';
 import { and, arrayContains, asc, desc, eq, gt, gte, ilike, lte, sql, type SQL } from 'drizzle-orm';
 import { BODIES, DRIVES, FUELS, SORTS, type CarCard, type CarSort } from '#lib/cars/shared.js';
+import { parseArea, parseGot, type Got } from '#lib/spotting/areas.js';
+import { activitySql, gotSql, seenSql } from '#lib/server/spotting.js';

 export const PAGE_SIZE = 60;

@@ -17,6 +19,9 @@ export type CarFilters = {
 	from: number | null;
 	to: number | null;
 	sort: CarSort;
+	/** Area for the "most active" sort (?in=, default NL). */
+	area: string;
+	got: Got;
 	page: number;
 };

@@ -38,12 +43,16 @@ export function parseFilters(params: URLSearchParams): CarFilters {
 		market: pick(params.get('market'), ['nl', 'us'] as const),
 		from: year(params.get('from')),
 		to: year(params.get('to')),
-		sort: sort && sort in SORTS ? (sort as CarSort) : 'popular',
+		sort: sort && sort in SORTS ? (sort as CarSort) : 'active',
+		area: parseArea(params.get('in')),
+		got: parseGot(params.get('got')),
 		page: Math.min(Math.max(1, Math.floor(Number(params.get('page')) || 1)), 1000)
 	};
 }

 const cardColumns = {
+	id: carModels.id,
+	seen: seenSql('cars', carModels.id),
 	dex: carModels.dex,
 	slug: carModels.slug,
 	name: carModels.name,
@@ -74,7 +83,15 @@ export async function searchCars(f: CarFilters): Promise<{ cars: CarCard[]; tota
 	if (f.market === 'us') where.push(gt(carModels.variantCount, 0));
 	if (f.from) where.push(gte(carModels.lastYear, f.from));
 	if (f.to) where.push(lte(carModels.firstYear, f.to));
+	const got = gotSql('cars', carModels.id, f.got);
+	if (got) where.push(got);
 	const order = {
+		active: [
+			sql`${activitySql('cars', carModels.id, f.area)} desc`,
+			desc(carModels.nlCount),
+			desc(carModels.variantCount),
+			asc(carModels.dex)
+		],
 		dex: [asc(carModels.dex)],
 		popular: [desc(carModels.nlCount), asc(carModels.dex)],
 		name: [asc(carModels.name), asc(carBrands.name)],
@@ -104,6 +121,7 @@ export async function searchCars(f: CarFilters): Promise<{ cars: CarCard[]; tota
 }

 export type BrandTile = {
+	id: number;
 	slug: string;
 	name: string;
 	models: number;
@@ -125,6 +143,7 @@ export async function carOverview(): Promise<Overview> {
 	const [brands, [counts]] = await Promise.all([
 		db
 			.select({
+				id: carBrands.id,
 				slug: carBrands.slug,
 				name: carBrands.name,
 				models: carBrands.modelCount,
--- a/src/lib/server/planes.ts
+++ b/src/lib/server/planes.ts
@@ -12,6 +12,8 @@ import {
 	type PlaneEra,
 	type PlaneSort
 } from '#lib/planes/shared.js';
+import { parseArea, parseGot, type Got } from '#lib/spotting/areas.js';
+import { activitySql, gotSql, seenSql } from '#lib/server/spotting.js';

 export const PAGE_SIZE = 60;

@@ -23,6 +25,9 @@ export type PlaneFilters = {
 	era: PlaneEra | '';
 	service: '' | 'yes' | 'no';
 	sort: PlaneSort;
+	/** Area for the "most active" sort (?in=, default NL). */
+	area: string;
+	got: Got;
 	page: number;
 };

@@ -38,12 +43,16 @@ export function parseFilters(params: URLSearchParams): PlaneFilters {
 		engine: pick(params.get('engine'), ENGINES),
 		era: pick(params.get('era'), Object.keys(ERAS) as PlaneEra[]),
 		service: pick(params.get('service'), ['yes', 'no'] as const),
-		sort: sort && sort in SORTS ? (sort as PlaneSort) : 'built',
+		sort: sort && sort in SORTS ? (sort as PlaneSort) : 'active',
+		area: parseArea(params.get('in')),
+		got: parseGot(params.get('got')),
 		page: Math.min(Math.max(1, Math.floor(Number(params.get('page')) || 1)), 1000)
 	};
 }

 const cardColumns = {
+	id: planeTypes.id,
+	seen: seenSql('planes', planeTypes.id),
 	dex: planeTypes.dex,
 	slug: planeTypes.slug,
 	name: planeTypes.name,
@@ -89,7 +98,14 @@ export async function searchPlanes(
 	}
 	if (f.service === 'yes') where.push(eq(planeTypes.inService, true));
 	if (f.service === 'no') where.push(eq(planeTypes.inService, false));
+	const got = gotSql('planes', planeTypes.id, f.got);
+	if (got) where.push(got);
 	const order = {
+		active: [
+			sql`${activitySql('planes', planeTypes.id, f.area)} desc`,
+			sql`${planeTypes.numberBuilt} desc nulls last`,
+			asc(planeTypes.dex)
+		],
 		built: [sql`${planeTypes.numberBuilt} desc nulls last`, asc(planeTypes.dex)],
 		dex: [asc(planeTypes.dex)],
 		name: [asc(planeTypes.fullName)],
@@ -120,6 +136,7 @@ export async function searchPlanes(
 }

 export type MakerTile = {
+	id: number;
 	slug: string;
 	name: string;
 	types: number;
@@ -141,6 +158,7 @@ export async function planeOverview(): Promise<Overview> {
 	const [makers, [counts]] = await Promise.all([
 		db
 			.select({
+				id: planeMakers.id,
 				slug: planeMakers.slug,
 				name: planeMakers.name,
 				types: planeMakers.typeCount,
--- a/src/lib/server/spotting.ts
+++ b/src/lib/server/spotting.ts
@@ -0,0 +1,164 @@
+// Shared server helpers for the four spotting pokedexes (cars, planes, trains, wildlife):
+// Stan's collection (<schema>.seen) and the per-country activity areas (<schema>.activity,
+// filled by scripts/spotters-activity.ts). Only the owner writes `seen`; everyone can read.
+import { client } from '#lib/server/db/index.js';
+import { isRegion } from '#lib/spotting/areas.js';
+
+export type Tracker = 'cars' | 'planes' | 'trains' | 'wildlife';
+
+/** Constant identifiers only (never user input), so building SQL text from them is safe. */
+const T: Record<Tracker, { items: string; col: string; group: string }> = {
+	cars: { items: 'cars.models', col: 'model_id', group: 'brand_id' },
+	planes: { items: 'planes.types', col: 'type_id', group: 'maker_id' },
+	trains: { items: 'trains.types', col: 'type_id', group: 'maker_id' },
+	wildlife: { items: 'wildlife.species', col: 'species_id', group: 'group_id' }
+};
+export const isTracker = (t: string): t is Tracker => t in T;
+
+export type SeenEntry = { seenOn: string | null; note: string | null; at: string };
+
+/** Overall progress: seen / total. */
+export async function progress(tracker: Tracker): Promise<{ seen: number; total: number }> {
+	const { items, col } = T[tracker];
+	const schema = tracker;
+	const [r] = await client.unsafe<{ seen: number; total: number }[]>(
+		`select (select count(*)::int from ${schema}.seen s join ${items} i on i.id = s.${col}) as seen,
+		        (select count(*)::int from ${items}) as total`
+	);
+	return r;
+}
+
+/** Seen count per group (brand / maker / animal group id). */
+export async function seenByGroup(tracker: Tracker): Promise<Map<number, number>> {
+	const { items, col, group } = T[tracker];
+	const rows = await client.unsafe<{ g: number; n: number }[]>(
+		`select i.${group} as g, count(*)::int as n from ${tracker}.seen s
+		 join ${items} i on i.id = s.${col} group by 1`
+	);
+	return new Map(rows.map((r) => [r.g, r.n]));
+}
+
+/** Seen / total for one group. */
+export async function groupProgress(tracker: Tracker, groupId: number) {
+	const { items, col, group } = T[tracker];
+	const [r] = await client.unsafe<{ seen: number; total: number }[]>(
+		`select count(s.${col})::int as seen, count(*)::int as total
+		 from ${items} i left join ${tracker}.seen s on s.${col} = i.id where i.${group} = $1`,
+		[groupId]
+	);
+	return r;
+}
+
+/** Seen / total for an arbitrary set of item ids (e.g. a train operator's fleet). */
+export async function idsProgress(tracker: Tracker, ids: number[]) {
+	if (!ids.length) return { seen: 0, total: 0 };
+	const { col } = T[tracker];
+	const [r] = await client.unsafe<{ seen: number }[]>(
+		`select count(*)::int as seen from ${tracker}.seen where ${col} = any($1::int[])`,
+		[ids]
+	);
+	return { seen: r.seen, total: new Set(ids).size };
+}
+
+export async function getSeen(tracker: Tracker, id: number): Promise<SeenEntry | null> {
+	const { col } = T[tracker];
+	const [r] = await client.unsafe<{ seen_on: string | null; note: string | null; at: Date }[]>(
+		`select seen_on::text, note, created_at as at from ${tracker}.seen where ${col} = $1`,
+		[id]
+	);
+	return r ? { seenOn: r.seen_on, note: r.note, at: r.at.toISOString() } : null;
+}
+
+/** Marks (or unmarks) an item as seen. Returns false when the item does not exist. */
+export async function setSeen(
+	tracker: Tracker,
+	id: number,
+	seen: boolean,
+	seenOn: string | null = null,
+	note: string | null = null
+): Promise<boolean> {
+	const { items, col } = T[tracker];
+	const [exists] = await client.unsafe(`select 1 from ${items} where id = $1`, [id]);
+	if (!exists) return false;
+	if (!seen) {
+		await client.unsafe(`delete from ${tracker}.seen where ${col} = $1`, [id]);
+		return true;
+	}
+	await client.unsafe(
+		`insert into ${tracker}.seen (${col}, seen_on, note) values ($1, $2::date, $3)
+		 on conflict (${col}) do update set seen_on = excluded.seen_on, note = excluded.note`,
+		[id, seenOn, note]
+	);
+	return true;
+}
+
+const areaCache = new Map<Tracker, { at: number; value: Set<string> }>();
+/** Areas that have any activity rows (cached 10 min), to grey out empty choices. */
+export async function areasWithData(tracker: Tracker): Promise<string[]> {
+	const hit = areaCache.get(tracker);
+	if (hit && Date.now() - hit.at < 600_000) return [...hit.value];
+	const rows = await client.unsafe<{ area: string }[]>(
+		`select distinct area from ${tracker}.activity`
+	);
+	const value = new Set(rows.map((r) => r.area));
+	if (value.size) areaCache.set(tracker, { at: Date.now(), value });
+	return [...value];
+}
+
+/** Validates a POSTed seen change. */
+export function parseSeenBody(body: unknown) {
+	const b = (body ?? {}) as Record<string, unknown>;
+	const id = Number(b.id);
+	if (!Number.isInteger(id) || id <= 0) return null;
+	const seen = b.seen !== false;
+	const seenOn =
+		typeof b.seenOn === 'string' && /^\d{4}-\d{2}-\d{2}$/.test(b.seenOn) ? b.seenOn : null;
+	const note = typeof b.note === 'string' && b.note.trim() ? b.note.trim().slice(0, 500) : null;
+	return { id, seen, seenOn, note };
+}
+
+export { isRegion };
+
+// ---- SQL fragments for the drizzle list queries ----
+import { sql, type AnyColumn, type SQL } from 'drizzle-orm';
+
+/** `exists(seen)` for a card column. */
+export const seenSql = (tracker: Tracker, idCol: AnyColumn) =>
+	sql<boolean>`exists(select 1 from ${sql.raw(`${tracker}.seen`)} s where s.${sql.raw(T[tracker].col)} = ${idCol})`;
+
+/** Activity score of an item in an area (0 when unknown), for the "most active" sort. */
+export const activitySql = (tracker: Tracker, idCol: AnyColumn, area: string) =>
+	sql<number>`coalesce((select a.score from ${sql.raw(`${tracker}.activity`)} a where a.${sql.raw(T[tracker].col)} = ${idCol} and a.area = ${area}), 0)`;
+
+/** ?got=yes|no filter. */
+export function gotSql(tracker: Tracker, idCol: AnyColumn, got: string): SQL | null {
+	if (got === 'yes') return seenSql(tracker, idCol);
+	if (got === 'no') return sql`not ${seenSql(tracker, idCol)}`;
+	return null;
+}
+
+const groupActCache = new Map<string, { at: number; value: Map<number, number> }>();
+/** Summed activity of each group's entries in an area (cached 10 min): ranks brand/maker tiles. */
+export async function groupActivity(tracker: Tracker, area: string): Promise<Map<number, number>> {
+	const k = `${tracker}:${area}`;
+	const hit = groupActCache.get(k);
+	if (hit && Date.now() - hit.at < 600_000) return hit.value;
+	const { items, col, group } = T[tracker];
+	const rows = await client.unsafe<{ g: number; s: number }[]>(
+		`select i.${group} as g, sum(a.score)::float8 as s from ${tracker}.activity a
+		 join ${items} i on i.id = a.${col} where a.area = $1 group by 1`,
+		[area]
+	);
+	const value = new Map(rows.map((r) => [r.g, r.s]));
+	groupActCache.set(k, { at: Date.now(), value });
+	return value;
+}
+
+/** Orders tiles by area activity (then their existing order). */
+export function rankByActivity<T extends { id: number }>(tiles: T[], act: Map<number, number>) {
+	if (!act.size) return tiles;
+	return tiles
+		.map((t, i) => ({ t, i, s: act.get(t.id) ?? 0 }))
+		.sort((a, b) => b.s - a.s || a.i - b.i)
+		.map((x) => x.t);
+}
--- a/src/lib/server/trains.ts
+++ b/src/lib/server/trains.ts
@@ -19,6 +19,8 @@ import {
 	type TrainEra,
 	type TrainSort
 } from '#lib/trains/shared.js';
+import { parseArea, parseGot, type Got } from '#lib/spotting/areas.js';
+import { activitySql, gotSql, seenSql } from '#lib/server/spotting.js';

 export const PAGE_SIZE = 60;

@@ -31,6 +33,9 @@ export type TrainFilters = {
 	era: TrainEra | '';
 	service: '' | 'yes' | 'no';
 	sort: TrainSort;
+	/** Area for the "most active" sort (?in=, default NL). */
+	area: string;
+	got: Got;
 	page: number;
 };

@@ -47,12 +52,16 @@ export function parseFilters(params: URLSearchParams): TrainFilters {
 		country: (params.get('country') ?? '').trim().slice(0, 80),
 		era: pick(params.get('era'), Object.keys(ERAS) as TrainEra[]),
 		service: pick(params.get('service'), ['yes', 'no'] as const),
-		sort: sort && sort in SORTS ? (sort as TrainSort) : 'built',
+		sort: sort && sort in SORTS ? (sort as TrainSort) : 'active',
+		area: parseArea(params.get('in')),
+		got: parseGot(params.get('got')),
 		page: Math.min(Math.max(1, Math.floor(Number(params.get('page')) || 1)), 1000)
 	};
 }

 const cardColumns = {
+	id: trainTypes.id,
+	seen: seenSql('trains', trainTypes.id),
 	dex: trainTypes.dex,
 	slug: trainTypes.slug,
 	name: trainTypes.name,
@@ -73,8 +82,13 @@ const cardColumns = {
 };

 const escapeLike = (s: string) => s.replace(/[\\%_]/g, (c) => `\\${c}`);
-const order = (sort: TrainSort) =>
+const order = (sort: TrainSort, area = 'nl') =>
 	({
+		active: [
+			sql`${activitySql('trains', trainTypes.id, area)} desc`,
+			sql`${trainTypes.numberBuilt} desc nulls last`,
+			asc(trainTypes.dex)
+		],
 		built: [sql`${trainTypes.numberBuilt} desc nulls last`, asc(trainTypes.dex)],
 		dex: [asc(trainTypes.dex)],
 		name: [asc(trainTypes.fullName)],
@@ -107,6 +121,8 @@ export async function searchTrains(
 	}
 	if (f.service === 'yes') where.push(eq(trainTypes.inService, true));
 	if (f.service === 'no') where.push(eq(trainTypes.inService, false));
+	const got = gotSql('trains', trainTypes.id, f.got);
+	if (got) where.push(got);
 	const condition = where.length ? and(...where) : undefined;
 	const [trains, [{ total }]] = await Promise.all([
 		db
@@ -114,7 +130,7 @@ export async function searchTrains(
 			.from(trainTypes)
 			.innerJoin(trainMakers, eq(trainMakers.id, trainTypes.makerId))
 			.where(condition)
-			.orderBy(...order(f.sort))
+			.orderBy(...order(f.sort, f.area))
 			.limit(PAGE_SIZE)
 			.offset((f.page - 1) * PAGE_SIZE),
 		db
@@ -127,6 +143,7 @@ export async function searchTrains(
 }

 export type MakerTile = {
+	id: number;
 	slug: string;
 	name: string;
 	types: number;
@@ -165,6 +182,7 @@ export async function trainOverview(): Promise<Overview> {
 	const [makers, operators, countries, [counts]] = await Promise.all([
 		db
 			.select({
+				id: trainMakers.id,
 				slug: trainMakers.slug,
 				name: trainMakers.name,
 				types: trainMakers.typeCount,
--- a/src/lib/server/wildlife.ts
+++ b/src/lib/server/wildlife.ts
@@ -11,6 +11,8 @@ import {
 	type WildSort,
 	type WildWhere
 } from '#lib/wildlife/shared.js';
+import { parseArea, parseGot, type Got } from '#lib/spotting/areas.js';
+import { activitySql, gotSql, seenSql } from '#lib/server/spotting.js';

 export const PAGE_SIZE = 60;

@@ -21,6 +23,9 @@ export type WildFilters = {
 	where: WildWhere | '';
 	photos: '' | 'yes';
 	sort: WildSort;
+	/** Area for the "most active" sort (?in=, default NL). */
+	area: string;
+	got: Got;
 	page: number;
 };

@@ -36,12 +41,16 @@ export function parseFilters(params: URLSearchParams, group = ''): WildFilters {
 		status: status === 'threatened' ? status : pick(status, STATUSES),
 		where: pick(params.get('where'), Object.keys(WHERE) as WildWhere[]),
 		photos: pick(params.get('photos'), ['yes'] as const),
-		sort: sort && sort in SORTS ? (sort as WildSort) : 'nl',
+		sort: sort && sort in SORTS ? (sort as WildSort) : 'active',
+		area: parseArea(params.get('in')),
+		got: parseGot(params.get('got')),
 		page: Math.min(Math.max(1, Math.floor(Number(params.get('page')) || 1)), 1000)
 	};
 }

 const cardColumns = {
+	id: wildlifeSpecies.id,
+	seen: seenSql('wildlife', wildlifeSpecies.id),
 	dex: wildlifeSpecies.dex,
 	slug: wildlifeSpecies.slug,
 	groupSlug: wildlifeGroups.slug,
@@ -77,7 +86,15 @@ export async function searchSpecies(
 	if (f.where === 'world')
 		where.push(and(eq(wildlifeSpecies.nlObs, 0), eq(wildlifeSpecies.europeObs, 0))!);
 	if (f.photos) where.push(isNotNull(wildlifeSpecies.photo));
+	const got = gotSql('wildlife', wildlifeSpecies.id, f.got);
+	if (got) where.push(got);
 	const order = {
+		active: [
+			sql`${activitySql('wildlife', wildlifeSpecies.id, f.area)} desc`,
+			sql`${wildlifeSpecies.nlObs} desc`,
+			sql`${wildlifeSpecies.worldObs} desc`,
+			asc(wildlifeSpecies.dex)
+		],
 		nl: [
 			sql`${wildlifeSpecies.nlObs} desc`,
 			sql`${wildlifeSpecies.worldObs} desc`,
@@ -114,6 +131,7 @@ export async function searchSpecies(

 type Overview = {
 	groups: {
+		id: number;
 		slug: string;
 		name: string;
 		nameNl: string;
@@ -132,6 +150,7 @@ export async function wildlifeOverview(): Promise<Overview> {
 	const [groups, [counts]] = await Promise.all([
 		db
 			.select({
+				id: wildlifeGroups.id,
 				slug: wildlifeGroups.slug,
 				name: wildlifeGroups.name,
 				nameNl: wildlifeGroups.nameNl,
--- a/src/lib/spotting/AreaSelect.svelte
+++ b/src/lib/spotting/AreaSelect.svelte
@@ -0,0 +1,31 @@
+<script lang="ts">
+	// "most active in …" selector (?in=): countries and regions with precomputed scores.
+	import { NativeSelect } from '#lib/components/ui/native-select/index.js';
+	import { AREA_OPTIONS, areaLabel } from './areas.js';
+
+	let {
+		value,
+		available = [],
+		onchange
+	}: { value: string; available?: string[]; onchange?: () => void } = $props();
+	const has = $derived(new Set(available));
+	const known = $derived(
+		new Set([...AREA_OPTIONS.countries, ...AREA_OPTIONS.regions].map((o) => o.code))
+	);
+</script>
+
+<NativeSelect name="in" aria-label="Most active in country or region" {value} {onchange}>
+	{#if !known.has(value)}<option {value}>📍 {areaLabel(value)}</option>{/if}
+	<optgroup label="Country">
+		{#each AREA_OPTIONS.countries as o (o.code)}
+			<option value={o.code} disabled={available.length > 0 && !has.has(o.code)}
+				>📍 {o.label}</option
+			>
+		{/each}
+	</optgroup>
+	<optgroup label="Region">
+		{#each AREA_OPTIONS.regions as o (o.code)}
+			<option value={o.code} disabled={available.length > 0 && !has.has(o.code)}>{o.label}</option>
+		{/each}
+	</optgroup>
+</NativeSelect>
--- a/src/lib/spotting/SeenPanel.svelte
+++ b/src/lib/spotting/SeenPanel.svelte
@@ -0,0 +1,154 @@
+<script lang="ts">
+	// Detail-page collection panel: the owner marks an entry as seen with an optional date
+	// and note; visitors see Stan's sighting read-only.
+	import { page } from '$app/state';
+	import { isSeen, saveSeen, type SpotTracker } from './seen.svelte.js';
+
+	let {
+		tracker,
+		id,
+		entry,
+		label
+	}: {
+		tracker: SpotTracker;
+		id: number;
+		entry: { seenOn: string | null; note: string | null } | null;
+		label: string;
+	} = $props();
+	const owner = $derived(!!page.data.isOwner);
+	const on = $derived(isSeen(tracker, id, !!entry));
+	const today = () => new Date().toISOString().slice(0, 10);
+	let seenOn = $state('');
+	let note = $state('');
+	let busy = $state(false);
+	let failed = $state(false);
+	$effect.pre(() => {
+		seenOn = entry?.seenOn ?? '';
+		note = entry?.note ?? '';
+	});
+	async function save(seen: boolean) {
+		busy = true;
+		failed = false;
+		const ok = await saveSeen(tracker, id, seen, {
+			seenOn: seen ? seenOn || (entry ? null : today()) : null,
+			note: seen ? note : null
+		});
+		failed = !ok;
+		busy = false;
+	}
+</script>
+
+{#if owner}
+	<section class={['panel', { on }]} aria-label="My collection">
+		<div class="head">
+			<strong>{on ? '✅ Collected' : '⬜ Not collected yet'}</strong>
+			<button type="button" class="btn primary" disabled={busy} onclick={() => save(!on)}>
+				{on ? 'Unmark' : `Mark ${label} as seen`}
+			</button>
+		</div>
+		{#if on}
+			<form
+				class="fields"
+				onsubmit={(e) => {
+					e.preventDefault();
+					save(true);
+				}}
+			>
+				<label>
+					<span>seen on</span>
+					<input type="date" bind:value={seenOn} max={today()} />
+				</label>
+				<label class="grow">
+					<span>note</span>
+					<input type="text" bind:value={note} maxlength="500" placeholder="where, who with…" />
+				</label>
+				<button type="submit" class="btn" disabled={busy}>save</button>
+			</form>
+		{/if}
+		{#if failed}<p class="err">Couldn't save. Are you still logged in?</p>{/if}
+	</section>
+{:else if on && entry}
+	<section class="panel on" aria-label="Stan's collection">
+		<strong>✅ Stan has seen this one</strong>{#if entry.seenOn}
+			<span class="muted"> on {entry.seenOn}</span>{/if}{#if entry.note}
+			<p class="muted mt-1">“{entry.note}”</p>{/if}
+	</section>
+{/if}
+
+<style>
+	.panel {
+		border: 1px solid var(--site-border);
+		border-radius: 0.8rem;
+		background: var(--site-surface);
+		padding: 0.75rem 0.95rem;
+		margin: 1rem 0;
+		font-size: 0.9rem;
+	}
+	.panel.on {
+		border-color: rgb(34 197 94 / 0.6);
+	}
+	.head {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		gap: 0.75rem;
+		flex-wrap: wrap;
+	}
+	.fields {
+		display: flex;
+		flex-wrap: wrap;
+		gap: 0.6rem;
+		align-items: flex-end;
+		margin-top: 0.7rem;
+	}
+	.fields label {
+		display: flex;
+		flex-direction: column;
+		gap: 0.2rem;
+		font-size: 0.75rem;
+		color: var(--site-muted);
+	}
+	.fields .grow {
+		flex: 1 1 12rem;
+	}
+	.fields input {
+		border: 1px solid var(--site-border);
+		border-radius: 0.45rem;
+		background: var(--site-bg, transparent);
+		color: var(--site-fg, inherit);
+		padding: 0.35rem 0.55rem;
+		font-size: 0.85rem;
+	}
+	.btn {
+		border: 1px solid var(--site-border);
+		border-radius: 999px;
+		padding: 0.3rem 0.85rem;
+		font-size: 0.82rem;
+		font-weight: 500;
+		background: var(--site-surface);
+	}
+	.btn:hover {
+		background: var(--site-hover);
+	}
+	.btn.primary {
+		background: rgb(22 163 74);
+		border-color: rgb(22 163 74);
+		color: #fff;
+	}
+	.on .btn.primary {
+		background: var(--site-surface);
+		border-color: var(--site-border);
+		color: inherit;
+	}
+	.btn:disabled {
+		opacity: 0.6;
+	}
+	.muted {
+		color: var(--site-muted);
+	}
+	.err {
+		margin-top: 0.5rem;
+		color: rgb(239 68 68);
+		font-size: 0.8rem;
+	}
+</style>
--- a/src/lib/spotting/SpotItem.svelte
+++ b/src/lib/spotting/SpotItem.svelte
@@ -0,0 +1,88 @@
+<script lang="ts">
+	// Wraps a dex card: a ✓ badge when Stan has seen it, and for the owner a toggle button
+	// (kept outside the card's <a> so it stays valid, focusable HTML).
+	import { page } from '$app/state';
+	import type { Snippet } from 'svelte';
+	import { isSeen, saveSeen, type SpotTracker } from './seen.svelte.js';
+
+	let {
+		tracker,
+		id,
+		seen = false,
+		label,
+		children
+	}: {
+		tracker: SpotTracker;
+		id: number;
+		seen?: boolean;
+		label: string;
+		children: Snippet;
+	} = $props();
+	const owner = $derived(!!page.data.isOwner);
+	const on = $derived(isSeen(tracker, id, seen));
+	let busy = $state(false);
+	async function toggle() {
+		busy = true;
+		await saveSeen(tracker, id, !on);
+		busy = false;
+	}
+</script>
+
+<div class={['spot', { on }]}>
+	{@render children()}
+	{#if owner}
+		<button
+			type="button"
+			class="mark"
+			aria-pressed={on}
+			disabled={busy}
+			onclick={toggle}
+			title={on ? `Collected. Click to unmark ${label}` : `Mark ${label} as seen`}
+			>{on ? '✓' : '+'}<span class="sr-only">{on ? 'collected' : 'mark as seen'}</span></button
+		>
+	{:else if on}
+		<span class="mark" title="Stan has seen this one">✓<span class="sr-only">collected</span></span>
+	{/if}
+</div>
+
+<style>
+	.spot {
+		position: relative;
+		height: 100%;
+	}
+	.spot.on > :global(a) {
+		box-shadow: 0 0 0 2px rgb(34 197 94 / 0.75);
+	}
+	.mark {
+		position: absolute;
+		top: 0.5rem;
+		left: 0.5rem;
+		z-index: 2;
+		display: grid;
+		place-items: center;
+		width: 1.9rem;
+		height: 1.9rem;
+		border-radius: 999px;
+		font-size: 1rem;
+		font-weight: 700;
+		line-height: 1;
+		color: #fff;
+		background: rgb(0 0 0 / 0.55);
+		border: 1.5px solid rgb(255 255 255 / 0.7);
+		backdrop-filter: blur(4px);
+		transition:
+			background 0.15s,
+			transform 0.15s;
+	}
+	button.mark:hover {
+		transform: scale(1.08);
+		background: rgb(0 0 0 / 0.75);
+	}
+	.on .mark {
+		background: rgb(22 163 74);
+		border-color: rgb(187 247 208);
+	}
+	button.mark:disabled {
+		opacity: 0.6;
+	}
+</style>
--- a/src/lib/spotting/SpotProgress.svelte
+++ b/src/lib/spotting/SpotProgress.svelte
@@ -0,0 +1,98 @@
+<script lang="ts">
+	// "✅ 12 / 3,694 collected" with a bar; read-only for visitors.
+	import { page } from '$app/state';
+	import ProgressBar from '#lib/components/ProgressBar.svelte';
+	import { GOT } from './areas.js';
+
+	let {
+		seen,
+		total,
+		label = 'collected',
+		href = null,
+		got = null
+	}: {
+		seen: number;
+		total: number;
+		label?: string;
+		href?: string | null;
+		/** When set, shows all / collected / still-to-go chips that set ?got= on this page. */
+		got?: string | null;
+	} = $props();
+	const gotHref = (value: string) => {
+		// eslint-disable-next-line svelte/prefer-svelte-reactivity -- throwaway copy for a link
+		const params = new URLSearchParams(page.url.searchParams.toString());
+		if (value) params.set('got', value);
+		else params.delete('got');
+		const qs = params.toString();
+		return `${page.url.pathname}${qs ? `?${qs}` : ''}`;
+	};
+	const pct = $derived(total ? Math.round((seen / total) * 1000) / 10 : 0);
+</script>
+
+<div class="progress">
+	<div class="row">
+		<span
+			>✅ <strong class="tabular-nums">{seen.toLocaleString('en-GB')}</strong>
+			<span class="muted">/ {total.toLocaleString('en-GB')} {label}</span></span
+		>
+		<span class="muted tabular-nums"
+			>{pct}%{#if href}
+				· <a {href} class="underline">to go →</a>{/if}</span
+		>
+	</div>
+	<ProgressBar value={seen} max={total} label="{seen} of {total} {label}" small />
+	{#if got !== null}
+		<div class="chips">
+			{#each Object.entries(GOT) as [key, text] (key)}
+				<a
+					href={gotHref(key)}
+					class={['chip', { active: got === key }]}
+					aria-current={got === key ? 'true' : undefined}
+					data-sveltekit-noscroll
+					data-sveltekit-replacestate>{text}</a
+				>
+			{/each}
+		</div>
+	{/if}
+</div>
+
+<style>
+	.progress {
+		display: flex;
+		flex-direction: column;
+		gap: 0.35rem;
+		border: 1px solid var(--site-border);
+		border-radius: 0.75rem;
+		background: var(--site-surface);
+		padding: 0.65rem 0.9rem;
+	}
+	.row {
+		display: flex;
+		justify-content: space-between;
+		gap: 0.75rem;
+		font-size: 0.9rem;
+	}
+	.chips {
+		display: flex;
+		flex-wrap: wrap;
+		gap: 0.35rem;
+		margin-top: 0.15rem;
+	}
+	.chip {
+		border: 1px solid var(--site-border);
+		border-radius: 999px;
+		padding: 0.1rem 0.6rem;
+		font-size: 0.78rem;
+	}
+	.chip:hover {
+		background: var(--site-hover);
+	}
+	.chip.active {
+		border-color: var(--site-muted);
+		background: var(--site-hover);
+		font-weight: 600;
+	}
+	.muted {
+		color: var(--site-muted);
+	}
+</style>
--- a/src/lib/spotting/areas.ts
+++ b/src/lib/spotting/areas.ts
@@ -0,0 +1,277 @@
+// Countries and regions for the spotting pokedexes' "most active in ..." sort
+// (/trackers/cars, planes, trains, wildlife). Codes are lowercase ISO 3166-1 alpha-2
+// ("nl") or a region code ("europe"). Scores per area are precomputed into each
+// tracker's `activity` table by scripts/spotters-activity.ts; a region's score is the sum
+// of its countries' scores (wildlife: iNaturalist's own Europe / world counts).
+
+export const DEFAULT_AREA = 'nl';
+
+export type Region = { code: string; name: string; emoji: string; countries: readonly string[] };
+
+const EUROPE = [
+	'nl',
+	'be',
+	'lu',
+	'de',
+	'fr',
+	'gb',
+	'ie',
+	'es',
+	'pt',
+	'it',
+	'ch',
+	'at',
+	'dk',
+	'se',
+	'no',
+	'fi',
+	'is',
+	'pl',
+	'cz',
+	'sk',
+	'hu',
+	'si',
+	'hr',
+	'ba',
+	'rs',
+	'me',
+	'mk',
+	'al',
+	'gr',
+	'bg',
+	'ro',
+	'md',
+	'ua',
+	'by',
+	'lt',
+	'lv',
+	'ee',
+	'ru',
+	'mt',
+	'cy',
+	'li',
+	'mc',
+	'sm',
+	'ad',
+	'im',
+	'je',
+	'gg',
+	'xk',
+	'tr',
+	'ge',
+	'am',
+	'az'
+] as const;
+
+export const REGIONS: readonly Region[] = [
+	{ code: 'benelux', name: 'Benelux', emoji: '🧇', countries: ['nl', 'be', 'lu'] },
+	{ code: 'europe', name: 'Europe', emoji: '🇪🇺', countries: EUROPE },
+	{
+		code: 'north-america',
+		name: 'North America',
+		emoji: '🌎',
+		countries: ['us', 'ca', 'mx', 'cu', 'gt', 'cr', 'pa', 'jm', 'do', 'hn', 'sv', 'ni', 'bs', 'pr']
+	},
+	{
+		code: 'south-america',
+		name: 'South America',
+		emoji: '🌎',
+		countries: ['br', 'ar', 'cl', 'co', 'pe', 've', 'ec', 'bo', 'py', 'uy', 'gy', 'sr']
+	},
+	{
+		code: 'asia',
+		name: 'Asia',
+		emoji: '🌏',
+		countries: [
+			'jp',
+			'cn',
+			'kr',
+			'kp',
+			'tw',
+			'hk',
+			'in',
+			'id',
+			'th',
+			'vn',
+			'my',
+			'sg',
+			'ph',
+			'pk',
+			'bd',
+			'lk',
+			'mm',
+			'kh',
+			'la',
+			'np',
+			'mn',
+			'kz',
+			'uz',
+			'tm',
+			'kg',
+			'tj',
+			'ir',
+			'iq',
+			'sa',
+			'ae',
+			'il',
+			'jo',
+			'sy',
+			'lb',
+			'qa',
+			'kw',
+			'om',
+			'bh',
+			'ye',
+			'af',
+			'mo',
+			'bt',
+			'bn'
+		]
+	},
+	{
+		code: 'africa',
+		name: 'Africa',
+		emoji: '🌍',
+		countries: [
+			'za',
+			'eg',
+			'ma',
+			'dz',
+			'tn',
+			'ly',
+			'ng',
+			'ke',
+			'tz',
+			'ug',
+			'et',
+			'gh',
+			'zw',
+			'zm',
+			'mz',
+			'na',
+			'bw',
+			'ao',
+			'cd',
+			'cg',
+			'cm',
+			'sn',
+			'ci',
+			'sd',
+			'mg',
+			'mw',
+			'rw',
+			'sz',
+			'ls',
+			'er',
+			'sl',
+			'ga',
+			'ml',
+			'ne',
+			'bf',
+			'td',
+			'so',
+			'mu'
+		]
+	},
+	{
+		code: 'oceania',
+		name: 'Oceania',
+		emoji: '🦘',
+		countries: ['au', 'nz', 'pg', 'fj', 'nc', 'pf', 'sb', 'vu', 'ws', 'to']
+	},
+	{ code: 'world', name: 'the whole world', emoji: '🌐', countries: [] }
+];
+
+/** Countries offered in the selector (any ISO code with data also works via ?in=xx). */
+export const COUNTRIES = [
+	'nl',
+	'be',
+	'de',
+	'fr',
+	'gb',
+	'ie',
+	'es',
+	'pt',
+	'it',
+	'ch',
+	'at',
+	'dk',
+	'se',
+	'no',
+	'fi',
+	'pl',
+	'cz',
+	'hu',
+	'gr',
+	'tr',
+	'ru',
+	'ua',
+	'us',
+	'ca',
+	'mx',
+	'br',
+	'ar',
+	'jp',
+	'cn',
+	'kr',
+	'tw',
+	'in',
+	'id',
+	'th',
+	'au',
+	'nz',
+	'za'
+] as const;
+
+const regionByCode = new Map(REGIONS.map((r) => [r.code, r]));
+export const isRegion = (code: string) => regionByCode.has(code);
+export const regionOf = (code: string) => regionByCode.get(code) ?? null;
+
+let names: Intl.DisplayNames | null = null;
+/** "nl" -> "the Netherlands", "europe" -> "Europe". */
+export function areaName(code: string): string {
+	const region = regionByCode.get(code);
+	if (region) return region.name;
+	if (code === 'nl') return 'the Netherlands';
+	if (code === 'us') return 'the USA';
+	if (code === 'gb') return 'the UK';
+	try {
+		names ??= new Intl.DisplayNames(['en'], { type: 'region' });
+		return names.of(code.toUpperCase()) ?? code.toUpperCase();
+	} catch {
+		return code.toUpperCase();
+	}
+}
+
+/** Short label for chips and selects: "🇳🇱 Netherlands", "🇪🇺 Europe". */
+export function areaLabel(code: string): string {
+	const region = regionByCode.get(code);
+	if (region) return `${region.emoji} ${code === 'world' ? 'World' : region.name}`;
+	return `${flagOf(code)} ${areaName(code).replace(/^the /, '')}`;
+}
+
+export function flagOf(code: string): string {
+	if (!/^[a-z]{2}$/.test(code)) return '🏳️';
+	return String.fromCodePoint(...[...code.toUpperCase()].map((c) => 0x1f1a5 + c.charCodeAt(0)));
+}
+
+/** ?in= value -> a valid area code (default NL). */
+export function parseArea(value: string | null | undefined): string {
+	const v = (value ?? '').trim().toLowerCase();
+	if (regionByCode.has(v)) return v;
+	if (/^[a-z]{2}$/.test(v)) return v;
+	return DEFAULT_AREA;
+}
+
+/** Selector options, grouped: countries then regions. */
+export const AREA_OPTIONS = {
+	countries: COUNTRIES.map((code) => ({ code, label: areaLabel(code) })).sort((a, b) =>
+		a.code === 'nl' ? -1 : b.code === 'nl' ? 1 : a.label.slice(5).localeCompare(b.label.slice(5))
+	),
+	regions: REGIONS.map((r) => ({ code: r.code, label: areaLabel(r.code) }))
+};
+
+/** Collection filter (?got=). */
+export const GOT = { '': 'all', yes: '✅ collected', no: '⬜ still to go' } as const;
+export type Got = keyof typeof GOT;
+export const parseGot = (v: string | null): Got => (v === 'yes' || v === 'no' ? v : '');
--- a/src/lib/spotting/seen.svelte.ts
+++ b/src/lib/spotting/seen.svelte.ts
@@ -0,0 +1,50 @@
+// Client-side collection state for the spotting pokedexes: optimistic overrides on top of
+// what the server sent, so a toggle updates every card/panel for that entry at once.
+import { invalidateAll } from '$app/navigation';
+
+export type SpotTracker = 'cars' | 'planes' | 'trains' | 'wildlife';
+
+const overrides = $state<Record<string, boolean>>({});
+const key = (tracker: SpotTracker, id: number) => `${tracker}:${id}`;
+
+export function isSeen(tracker: SpotTracker, id: number, fromServer: boolean): boolean {
+	const k = key(tracker, id);
+	return k in overrides ? overrides[k] : fromServer;
+}
+
+/** Owner-only POST; reverts the optimistic state when the server refuses. */
+export async function saveSeen(
+	tracker: SpotTracker,
+	id: number,
+	seen: boolean,
+	extra: { seenOn?: string | null; note?: string | null } = {}
+): Promise<boolean> {
+	const k = key(tracker, id);
+	const before = k in overrides ? overrides[k] : undefined;
+	overrides[k] = seen;
+	try {
+		const res = await fetch(`/trackers/${tracker}/seen`, {
+			method: 'POST',
+			headers: { 'content-type': 'application/json' },
+			body: JSON.stringify({ id, seen, ...extra })
+		});
+		if (!res.ok) throw new Error(String(res.status));
+		await invalidateAll();
+		delete overrides[k];
+		return true;
+	} catch {
+		if (before === undefined) delete overrides[k];
+		else overrides[k] = before;
+		return false;
+	}
+}
+
+type HasSeen = { id: number; seen: boolean };
+/** How many of these entries are collected (respecting optimistic toggles). */
+export const countSeen = (tracker: SpotTracker, items: HasSeen[]) =>
+	items.reduce((n, x) => n + (isSeen(tracker, x.id, x.seen) ? 1 : 0), 0);
+/** Client-side ?got= filter for group pages that list every entry at once. */
+export function filterGot<T extends HasSeen>(tracker: SpotTracker, items: T[], got: string): T[] {
+	if (got !== 'yes' && got !== 'no') return items;
+	return items.filter((x) => isSeen(tracker, x.id, x.seen) === (got === 'yes'));
+}
--- a/src/lib/trains/MakerTile.svelte
+++ b/src/lib/trains/MakerTile.svelte
@@ -10,6 +10,7 @@
 	class={['tile', { compact }]}
 	title={maker.name}
 >
+	{#if maker.seen}<span class="got" title="{maker.seen} collected">✓ {maker.seen}</span>{/if}
 	<span class="mark"><BrandBadge name={maker.name} logo={maker.logo} size="xl" /></span>
 	<span class="name">{maker.name}</span>
 	{#if !compact}
@@ -22,7 +23,20 @@
 </a>

 <style>
+	.got {
+		position: absolute;
+		top: 0.4rem;
+		right: 0.4rem;
+		z-index: 1;
+		border-radius: 999px;
+		padding: 0.05rem 0.4rem;
+		font-size: 0.68rem;
+		font-weight: 600;
+		color: #fff;
+		background: rgb(22 163 74);
+	}
 	.tile {
+		position: relative;
 		display: flex;
 		flex-direction: column;
 		align-items: center;
--- a/src/lib/trains/shared.ts
+++ b/src/lib/trains/shared.ts
@@ -42,6 +42,7 @@ export const ERAS = {
 } as const;
 export type TrainEra = keyof typeof ERAS;
 export const SORTS = {
+	active: 'most active in…',
 	built: 'most built',
 	dex: 'dex #',
 	name: 'name',
@@ -205,6 +206,8 @@ export const fmtM = (m: number) => `${m >= 100 ? Math.round(m) : Math.round(m *
 export const fmtT = (t: number) => `${t >= 100 ? Math.round(t) : Math.round(t * 10) / 10} t`;

 export type TrainCard = {
+	id: number;
+	seen: boolean;
 	dex: number;
 	slug: string;
 	name: string;
@@ -225,6 +228,8 @@ export type TrainCard = {
 };

 export type MakerTileData = {
+	/** Entries Stan has collected in this group (optional). */
+	seen?: number;
 	slug: string;
 	name: string;
 	types: number;
--- a/src/lib/wildlife/GroupTile.svelte
+++ b/src/lib/wildlife/GroupTile.svelte
@@ -10,6 +10,7 @@
 	title="{group.name} · {group.nameNl}"
 	style:--hue={groupHue(group.slug)}
 >
+	{#if group.seen}<span class="got" title="{group.seen} collected">✓ {group.seen}</span>{/if}
 	{#if group.photo}
 		<img
 			src={photoAt(group.photo, compact ? 'small' : 'medium')}
@@ -31,6 +32,18 @@
 </a>

 <style>
+	.got {
+		position: absolute;
+		top: 0.4rem;
+		right: 0.4rem;
+		z-index: 1;
+		border-radius: 999px;
+		padding: 0.05rem 0.4rem;
+		font-size: 0.68rem;
+		font-weight: 600;
+		color: #fff;
+		background: rgb(22 163 74);
+	}
 	.tile {
 		position: relative;
 		display: flex;
--- a/src/lib/wildlife/SpeciesBrowser.svelte
+++ b/src/lib/wildlife/SpeciesBrowser.svelte
@@ -9,6 +9,10 @@
 		WHERE,
 		type SpeciesCard as Card
 	} from './shared.js';
+	import AreaSelect from '#lib/spotting/AreaSelect.svelte';
+	import { GOT } from '#lib/spotting/areas.js';
+	import SpotItem from '#lib/spotting/SpotItem.svelte';
+	import SpotProgress from '#lib/spotting/SpotProgress.svelte';
 	import { Input } from '#lib/components/ui/input/index.js';
 	import { NativeSelect } from '#lib/components/ui/native-select/index.js';
 	import Search from 'lucide-svelte/icons/search';
@@ -22,7 +26,10 @@
 		total,
 		pageSize,
 		groups = null,
-		quick = []
+		quick = [],
+		areas = [],
+		collected = null,
+		collectedLabel = 'species collected'
 	}: {
 		base: string;
 		filters: WildFilters;
@@ -31,11 +38,22 @@
 		pageSize: number;
 		groups?: { slug: string; name: string; emoji: string; speciesCount: number }[] | null;
 		quick?: { label: string; params: Record<string, string> }[];
+		areas?: string[];
+		collected?: { seen: number; total: number } | null;
+		collectedLabel?: string;
 	} = $props();

 	const pages = $derived(Math.max(1, Math.ceil(total / pageSize)));
 	const filtering = $derived(
-		!!(f.q || (groups && f.group) || f.status || f.where || f.photos || f.sort !== 'nl')
+		!!(
+			f.q ||
+			(groups && f.group) ||
+			f.status ||
+			f.where ||
+			f.photos ||
+			f.got ||
+			f.sort !== 'active'
+		)
 	);

 	let form: HTMLFormElement | undefined = $state();
@@ -61,6 +79,17 @@
 	}
 </script>

+{#if collected}
+	<div class="mb-5">
+		<SpotProgress
+			seen={collected.seen}
+			total={collected.total}
+			label={collectedLabel}
+			href={withParams({ got: 'no' })}
+		/>
+	</div>
+{/if}
+
 <form
 	bind:this={form}
 	method="GET"
@@ -104,6 +133,10 @@
 		<NativeSelect name="sort" aria-label="Sort by" value={f.sort} onchange={submit}>
 			{#each Object.entries(SORTS) as [key, label] (key)}<option value={key}>{label}</option>{/each}
 		</NativeSelect>
+		{#if f.sort === 'active'}<AreaSelect value={f.area} available={areas} onchange={submit} />{/if}
+		<NativeSelect name="got" aria-label="Collection" value={f.got} onchange={submit}>
+			{#each Object.entries(GOT) as [key, label] (key)}<option value={key}>{label}</option>{/each}
+		</NativeSelect>
 		<noscript><button type="submit" class="pill">search</button></noscript>
 	</div>
 </form>
@@ -126,7 +159,16 @@
 {#if species.length}
 	<ul class="grid">
 		{#each species as s, i (s.dex)}
-			<li><SpeciesCard species={s} eager={i < 4} /></li>
+			<li>
+				<SpotItem
+					tracker="wildlife"
+					id={s.id}
+					seen={s.seen}
+					label={s.nameEn ?? s.nameNl ?? s.scientificName}
+				>
+					<SpeciesCard species={s} eager={i < 4} />
+				</SpotItem>
+			</li>
 		{/each}
 	</ul>
 {:else}
--- a/src/lib/wildlife/shared.ts
+++ b/src/lib/wildlife/shared.ts
@@ -53,6 +53,7 @@ export const WHERE = {
 export type WildWhere = keyof typeof WHERE;

 export const SORTS = {
+	active: 'most active in…',
 	nl: 'most seen in NL',
 	world: 'most seen worldwide',
 	dex: 'dex #',
@@ -65,6 +66,8 @@ export const SORTS = {
 export type WildSort = keyof typeof SORTS;

 export type SpeciesCard = {
+	id: number;
+	seen: boolean;
 	dex: number;
 	slug: string;
 	groupSlug: string;
@@ -80,6 +83,8 @@ export type SpeciesCard = {
 	photoCount: number;
 };
 export type GroupTileData = {
+	/** Entries Stan has collected in this group (optional). */
+	seen?: number;
 	slug: string;
 	name: string;
 	nameNl: string;
--- a/src/routes/trackers/cars/+page.server.ts
+++ b/src/routes/trackers/cars/+page.server.ts
@@ -1,18 +1,41 @@
 import { carOverview, PAGE_SIZE, parseFilters, searchCars } from '#lib/server/cars.js';
+import {
+	areasWithData,
+	groupActivity,
+	progress,
+	rankByActivity,
+	seenByGroup
+} from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 export const load: PageServerLoad = async ({ url }) => {
 	const filters = parseFilters(url.searchParams);
-	const [{ cars, total }, overview] = await Promise.all([searchCars(filters), carOverview()]);
+	const [{ cars, total }, overview, collected, seenBrands, areas, act] = await Promise.all([
+		searchCars(filters),
+		carOverview(),
+		progress('cars'),
+		seenByGroup('cars'),
+		areasWithData('cars'),
+		groupActivity('cars', filters.area)
+	]);
 	return {
 		filters,
 		cars,
 		total,
 		pageSize: PAGE_SIZE,
+		collected,
+		areas,
 		brands: overview.brands.map(({ slug, name, models }) => ({ slug, name, models })),
-		topBrands: overview.byNl
+		topBrands: rankByActivity(overview.byNl, act)
 			.slice(0, 16)
-			.map(({ slug, name, models, nlCount, logo }) => ({ slug, name, models, nlCount, logo })),
+			.map(({ id, slug, name, models, nlCount, logo }) => ({
+				slug,
+				name,
+				models,
+				nlCount,
+				logo,
+				seen: seenBrands.get(id) ?? 0
+			})),
 		stats: overview.stats,
 		currentYear: new Date().getFullYear(),
 		seo: {
--- a/src/routes/trackers/cars/+page.svelte
+++ b/src/routes/trackers/cars/+page.svelte
@@ -14,6 +14,10 @@
 		LOGO_NOTE,
 		SORTS
 	} from '#lib/cars/shared.js';
+	import AreaSelect from '#lib/spotting/AreaSelect.svelte';
+	import { GOT } from '#lib/spotting/areas.js';
+	import SpotItem from '#lib/spotting/SpotItem.svelte';
+	import SpotProgress from '#lib/spotting/SpotProgress.svelte';
 	import { Input } from '#lib/components/ui/input/index.js';
 	import { NativeSelect } from '#lib/components/ui/native-select/index.js';
 	import Search from 'lucide-svelte/icons/search';
@@ -26,7 +30,7 @@
 	const f = $derived(data.filters);
 	const pages = $derived(Math.max(1, Math.ceil(data.total / data.pageSize)));
 	const filtering = $derived(
-		!!(f.q || f.brand || f.fuel || f.body || f.drive || f.market || f.from || f.to)
+		!!(f.q || f.brand || f.fuel || f.body || f.drive || f.market || f.from || f.to || f.got)
 	);

 	let form: HTMLFormElement | undefined = $state();
@@ -51,13 +55,14 @@
 		return `/trackers/cars${qs ? `?${qs}` : ''}`;
 	}

-	const quick = [
+	const quick: { label: string; params: Record<string, string> }[] = [
 		{ label: '📖 dex order', params: { sort: 'dex' } },
 		{ label: '⚡ electric', params: { fuel: 'electric', sort: 'popular' } },
 		{ label: '🍃 hybrids', params: { fuel: 'hybrid', sort: 'popular' } },
 		{ label: '🏎️ coupés', params: { body: 'coupe', sort: 'popular' } },
 		{ label: '💪 most powerful', params: { sort: 'power' } },
-		{ label: '🐎 Mustang', params: { q: 'mustang' } }
+		{ label: '🐎 Mustang', params: { q: 'mustang' } },
+		{ label: '⬜ still to go', params: { got: 'no' } }
 	];
 </script>

@@ -94,6 +99,15 @@
 		</div>
 	</dl>

+	<div class="mb-8">
+		<SpotProgress
+			seen={data.collected.seen}
+			total={data.collected.total}
+			label="models collected"
+			href={withParams({ got: 'no' })}
+		/>
+	</div>
+
 	{#if !filtering && f.page === 1}
 		<section class="mb-8" aria-labelledby="brands-heading">
 			<div class="mb-3 flex items-baseline justify-between gap-3">
@@ -184,6 +198,14 @@
 				{#each Object.entries(SORTS) as [key, label] (key)}<option value={key}>{label}</option
 					>{/each}
 			</NativeSelect>
+			{#if f.sort === 'active'}<AreaSelect
+					value={f.area}
+					available={data.areas}
+					onchange={submit}
+				/>{/if}
+			<NativeSelect name="got" aria-label="Collection" value={f.got} onchange={submit}>
+				{#each Object.entries(GOT) as [key, label] (key)}<option value={key}>{label}</option>{/each}
+			</NativeSelect>
 			<noscript><button type="submit" class="pill">search</button></noscript>
 		</div>
 	</form>
@@ -206,7 +228,11 @@
 	{#if data.cars.length}
 		<ul class="grid">
 			{#each data.cars as car, i (car.dex)}
-				<li><CarCard {car} current={data.currentYear} eager={i < 4} /></li>
+				<li>
+					<SpotItem tracker="cars" id={car.id} seen={car.seen} label={car.name}>
+						<CarCard {car} current={data.currentYear} eager={i < 4} />
+					</SpotItem>
+				</li>
 			{/each}
 		</ul>
 	{:else}
--- a/src/routes/trackers/cars/[brand]/+page.svelte
+++ b/src/routes/trackers/cars/[brand]/+page.svelte
@@ -10,11 +10,18 @@
 		thumbSrcset,
 		years
 	} from '#lib/cars/shared.js';
+	import { page } from '$app/state';
+	import { parseGot } from '#lib/spotting/areas.js';
+	import { countSeen, filterGot } from '#lib/spotting/seen.svelte.js';
+	import SpotItem from '#lib/spotting/SpotItem.svelte';
+	import SpotProgress from '#lib/spotting/SpotProgress.svelte';
 	import ArrowLeft from 'lucide-svelte/icons/arrow-left';
 	import type { PageProps } from './$types';

 	let { data }: PageProps = $props();
 	const b = $derived(data.brand);
+	const got = $derived(parseGot(page.url.searchParams.get('got')));
+	const shown = $derived(filterGot('cars', data.models, got));
 </script>

 <div class="mx-auto max-w-6xl px-4 py-12 sm:px-6 sm:py-16">
@@ -57,9 +64,21 @@
 		</div>
 	</header>

+	<div class="mb-6">
+		<SpotProgress
+			seen={countSeen('cars', data.models)}
+			total={data.models.length}
+			label="{b.name} models collected"
+			{got}
+		/>
+	</div>
 	<ul class="grid">
-		{#each data.models as car, i (car.dex)}
-			<li><CarCard {car} current={data.currentYear} eager={i < 4} /></li>
+		{#each shown as car, i (car.dex)}
+			<li>
+				<SpotItem tracker="cars" id={car.id} seen={car.seen} label={car.name}>
+					<CarCard {car} current={data.currentYear} eager={i < 4} />
+				</SpotItem>
+			</li>
 		{/each}
 	</ul>
 	<p class="mt-10 text-xs text-[var(--site-muted)]">
--- a/src/routes/trackers/cars/[brand]/[model]/+page.server.ts
+++ b/src/routes/trackers/cars/[brand]/[model]/+page.server.ts
@@ -1,6 +1,7 @@
 import { error } from '@sveltejs/kit';
 import { getModel } from '#lib/server/cars.js';
 import type { carModels, carVariants } from '#lib/server/db/schema/index.js';
+import { getSeen } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 type Model = typeof carModels.$inferSelect;
@@ -32,7 +33,9 @@ export const load: PageServerLoad = async ({ params }) => {
 	const found = await getModel(params.brand, params.model);
 	if (!found) error(404, 'No such car in the pokedex');
 	const { model, brand, variants, photos, prev, next } = found;
+	const seenEntry = await getSeen('cars', model.id);
 	return {
+		spot: { id: model.id, entry: seenEntry },
 		car: publicCar(model),
 		brand: { slug: brand.slug, name: brand.name, country: brand.country, logo: brand.logo },
 		variants: variants.map(publicVariant),
--- a/src/routes/trackers/cars/[brand]/[model]/+page.svelte
+++ b/src/routes/trackers/cars/[brand]/[model]/+page.svelte
@@ -19,6 +19,7 @@
 	import ChevronLeft from 'lucide-svelte/icons/chevron-left';
 	import ChevronRight from 'lucide-svelte/icons/chevron-right';
 	import Shuffle from 'lucide-svelte/icons/shuffle';
+	import SeenPanel from '#lib/spotting/SeenPanel.svelte';
 	import type { PageProps } from './$types';

 	let { data }: PageProps = $props();
@@ -174,6 +175,7 @@
 			</div>
 		{/if}
 	</header>
+	<SeenPanel tracker="cars" id={data.spot.id} entry={data.spot.entry} label="this one" />

 	{#if data.photos.length}
 		<Gallery photos={data.photos} name="{data.brand.name} {car.name}" wikipedia={car.wikipedia} />
--- a/src/routes/trackers/cars/brands/+page.server.ts
+++ b/src/routes/trackers/cars/brands/+page.server.ts
@@ -1,10 +1,12 @@
 import { carOverview } from '#lib/server/cars.js';
+import { seenByGroup } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 export const load: PageServerLoad = async () => {
-	const { byNl, stats } = await carOverview();
+	const [{ byNl, stats }, seen] = await Promise.all([carOverview(), seenByGroup('cars')]);
 	return {
-		brands: byNl.map(({ slug, name, models, nlCount, logo }) => ({
+		brands: byNl.map(({ id, slug, name, models, nlCount, logo }) => ({
+			seen: seen.get(id) ?? 0,
 			slug,
 			name,
 			models,
--- a/src/routes/trackers/cars/seen/+server.ts
+++ b/src/routes/trackers/cars/seen/+server.ts
@@ -0,0 +1,14 @@
+import { error, json } from '@sveltejs/kit';
+import { isOwner } from '#lib/server/owner.js';
+import { parseSeenBody, setSeen } from '#lib/server/spotting.js';
+import type { RequestHandler } from './$types';
+
+/** Owner-only: mark / unmark an entry as seen (collected), optionally with a date and note. */
+export const POST: RequestHandler = async (event) => {
+	if (!isOwner(event)) error(404, 'Not Found');
+	const body = parseSeenBody(await event.request.json().catch(() => null));
+	if (!body) error(400, 'Bad request');
+	const ok = await setSeen('cars', body.id, body.seen, body.seenOn, body.note);
+	if (!ok) error(404, 'No such entry');
+	return json({ ok: true, ...body });
+};
--- a/src/routes/trackers/planes/+page.server.ts
+++ b/src/routes/trackers/planes/+page.server.ts
@@ -1,18 +1,41 @@
 import { PAGE_SIZE, parseFilters, planeOverview, searchPlanes } from '#lib/server/planes.js';
+import {
+	areasWithData,
+	groupActivity,
+	progress,
+	rankByActivity,
+	seenByGroup
+} from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 export const load: PageServerLoad = async ({ url }) => {
 	const filters = parseFilters(url.searchParams);
-	const [{ planes, total }, overview] = await Promise.all([searchPlanes(filters), planeOverview()]);
+	const [{ planes, total }, overview, collected, seenMakers, areas, act] = await Promise.all([
+		searchPlanes(filters),
+		planeOverview(),
+		progress('planes'),
+		seenByGroup('planes'),
+		areasWithData('planes'),
+		groupActivity('planes', filters.area)
+	]);
 	return {
 		filters,
 		planes,
 		total,
 		pageSize: PAGE_SIZE,
+		collected,
+		areas,
 		makers: overview.makers.map(({ slug, name, types }) => ({ slug, name, types })),
-		topMakers: overview.byBuilt
+		topMakers: rankByActivity(overview.byBuilt, act)
 			.slice(0, 16)
-			.map(({ slug, name, types, built, logo }) => ({ slug, name, types, built, logo })),
+			.map(({ id, slug, name, types, built, logo }) => ({
+				slug,
+				name,
+				types,
+				built,
+				logo,
+				seen: seenMakers.get(id) ?? 0
+			})),
 		stats: overview.stats,
 		seo: {
 			title: 'Plane pokedex',
--- a/src/routes/trackers/planes/+page.svelte
+++ b/src/routes/trackers/planes/+page.svelte
@@ -14,6 +14,10 @@
 		roleLabel,
 		SORTS
 	} from '#lib/planes/shared.js';
+	import AreaSelect from '#lib/spotting/AreaSelect.svelte';
+	import { GOT } from '#lib/spotting/areas.js';
+	import SpotItem from '#lib/spotting/SpotItem.svelte';
+	import SpotProgress from '#lib/spotting/SpotProgress.svelte';
 	import { Input } from '#lib/components/ui/input/index.js';
 	import { NativeSelect } from '#lib/components/ui/native-select/index.js';
 	import Search from 'lucide-svelte/icons/search';
@@ -25,7 +29,9 @@

 	const f = $derived(data.filters);
 	const pages = $derived(Math.max(1, Math.ceil(data.total / data.pageSize)));
-	const filtering = $derived(!!(f.q || f.maker || f.role || f.engine || f.era || f.service));
+	const filtering = $derived(
+		!!(f.q || f.maker || f.role || f.engine || f.era || f.service || f.got)
+	);

 	let form: HTMLFormElement | undefined = $state();
 	let timer: ReturnType<typeof setTimeout> | undefined;
@@ -49,7 +55,7 @@
 		return `/trackers/planes${qs ? `?${qs}` : ''}`;
 	}

-	const quick = [
+	const quick: { label: string; params: Record<string, string> }[] = [
 		{ label: '📖 dex order', params: { sort: 'dex' } },
 		{ label: '🛫 airliners', params: { role: 'airliner', sort: 'built' } },
 		{ label: '🚁 helicopters', params: { role: 'helicopter', sort: 'built' } },
@@ -57,7 +63,8 @@
 		{ label: '🎖️ WW2 warbirds', params: { role: 'military', era: 'ww2', sort: 'built' } },
 		{ label: '🚀 fastest', params: { sort: 'fastest' } },
 		{ label: '🐘 heaviest', params: { sort: 'biggest' } },
-		{ label: '✈️ 737', params: { q: '737' } }
+		{ label: '✈️ 737', params: { q: '737' } },
+		{ label: '⬜ still to go', params: { got: 'no' } }
 	];
 </script>

@@ -94,6 +101,15 @@
 		</div>
 	</dl>

+	<div class="mb-8">
+		<SpotProgress
+			seen={data.collected.seen}
+			total={data.collected.total}
+			label="types collected"
+			href={withParams({ got: 'no' })}
+		/>
+	</div>
+
 	{#if !filtering && f.page === 1}
 		<section class="mb-8" aria-labelledby="makers-heading">
 			<div class="mb-3 flex items-baseline justify-between gap-3">
@@ -159,6 +175,14 @@
 				{#each Object.entries(SORTS) as [key, label] (key)}<option value={key}>{label}</option
 					>{/each}
 			</NativeSelect>
+			{#if f.sort === 'active'}<AreaSelect
+					value={f.area}
+					available={data.areas}
+					onchange={submit}
+				/>{/if}
+			<NativeSelect name="got" aria-label="Collection" value={f.got} onchange={submit}>
+				{#each Object.entries(GOT) as [key, label] (key)}<option value={key}>{label}</option>{/each}
+			</NativeSelect>
 			<noscript><button type="submit" class="pill">search</button></noscript>
 		</div>
 	</form>
@@ -181,7 +205,11 @@
 	{#if data.planes.length}
 		<ul class="grid">
 			{#each data.planes as plane, i (plane.dex)}
-				<li><PlaneCard {plane} eager={i < 4} /></li>
+				<li>
+					<SpotItem tracker="planes" id={plane.id} seen={plane.seen} label={plane.fullName}>
+						<PlaneCard {plane} eager={i < 4} />
+					</SpotItem>
+				</li>
 			{/each}
 		</ul>
 	{:else}
--- a/src/routes/trackers/planes/[maker]/+page.svelte
+++ b/src/routes/trackers/planes/[maker]/+page.svelte
@@ -11,10 +11,17 @@
 		thumbSrcset
 	} from '#lib/planes/shared.js';
 	import ArrowLeft from 'lucide-svelte/icons/arrow-left';
+	import { page } from '$app/state';
+	import { parseGot } from '#lib/spotting/areas.js';
+	import { countSeen, filterGot } from '#lib/spotting/seen.svelte.js';
+	import SpotItem from '#lib/spotting/SpotItem.svelte';
+	import SpotProgress from '#lib/spotting/SpotProgress.svelte';
 	import type { PageProps } from './$types';

 	let { data }: PageProps = $props();
 	const b = $derived(data.maker);
+	const got = $derived(parseGot(page.url.searchParams.get('got')));
+	const shown = $derived(filterGot('planes', data.types, got));
 </script>

 <div class="mx-auto max-w-6xl px-4 py-12 sm:px-6 sm:py-16">
@@ -61,9 +68,21 @@
 		</div>
 	</header>

+	<div class="mb-6">
+		<SpotProgress
+			seen={countSeen('planes', data.types)}
+			total={data.types.length}
+			label="{b.name} types collected"
+			{got}
+		/>
+	</div>
 	<ul class="grid">
-		{#each data.types as plane, i (plane.dex)}
-			<li><PlaneCard {plane} eager={i < 4} /></li>
+		{#each shown as plane, i (plane.dex)}
+			<li>
+				<SpotItem tracker="planes" id={plane.id} seen={plane.seen} label={plane.fullName}>
+					<PlaneCard {plane} eager={i < 4} />
+				</SpotItem>
+			</li>
 		{/each}
 	</ul>
 	<p class="mt-10 text-xs text-[var(--site-muted)]">
--- a/src/routes/trackers/planes/[maker]/[type]/+page.server.ts
+++ b/src/routes/trackers/planes/[maker]/[type]/+page.server.ts
@@ -1,6 +1,7 @@
 import { error } from '@sveltejs/kit';
 import { getType } from '#lib/server/planes.js';
 import type { planeTypes } from '#lib/server/db/schema/index.js';
+import { getSeen } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 type Type = typeof planeTypes.$inferSelect;
@@ -28,12 +29,14 @@ export const load: PageServerLoad = async ({ params }) => {
 	const found = await getType(params.maker, params.type);
 	if (!found) error(404, 'No such aircraft in the pokedex');
 	const { type, maker, photos, parent, variants, prev, next } = found;
+	const seenEntry = await getSeen('planes', type.id);
 	const strip = <T extends { id: number }>(row: T): Omit<T, 'id'> => {
 		const rest: Partial<T> = { ...row };
 		delete rest.id;
 		return rest as Omit<T, 'id'>;
 	};
 	return {
+		spot: { id: type.id, entry: seenEntry },
 		plane: publicType(type),
 		maker: { slug: maker.slug, name: maker.name, country: maker.country, logo: maker.logo },
 		photos,
--- a/src/routes/trackers/planes/[maker]/[type]/+page.svelte
+++ b/src/routes/trackers/planes/[maker]/[type]/+page.svelte
@@ -17,6 +17,7 @@
 	import ChevronLeft from 'lucide-svelte/icons/chevron-left';
 	import ChevronRight from 'lucide-svelte/icons/chevron-right';
 	import Shuffle from 'lucide-svelte/icons/shuffle';
+	import SeenPanel from '#lib/spotting/SeenPanel.svelte';
 	import type { PageProps } from './$types';

 	let { data }: PageProps = $props();
@@ -215,6 +216,7 @@
 				>{:else if p.inService === false}<span class="chip">retired</span>{/if}
 		</div>
 	</header>
+	<SeenPanel tracker="planes" id={data.spot.id} entry={data.spot.entry} label="this one" />

 	{#if data.photos.length}
 		<Gallery photos={data.photos} name={p.fullName} wikipedia={p.wikipedia} />
--- a/src/routes/trackers/planes/makers/+page.server.ts
+++ b/src/routes/trackers/planes/makers/+page.server.ts
@@ -1,10 +1,12 @@
 import { planeOverview } from '#lib/server/planes.js';
+import { seenByGroup } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 export const load: PageServerLoad = async () => {
-	const { byBuilt, stats } = await planeOverview();
+	const [{ byBuilt, stats }, seen] = await Promise.all([planeOverview(), seenByGroup('planes')]);
 	return {
-		makers: byBuilt.map(({ slug, name, types, built, logo }) => ({
+		makers: byBuilt.map(({ id, slug, name, types, built, logo }) => ({
+			seen: seen.get(id) ?? 0,
 			slug,
 			name,
 			types,
--- a/src/routes/trackers/planes/seen/+server.ts
+++ b/src/routes/trackers/planes/seen/+server.ts
@@ -0,0 +1,14 @@
+import { error, json } from '@sveltejs/kit';
+import { isOwner } from '#lib/server/owner.js';
+import { parseSeenBody, setSeen } from '#lib/server/spotting.js';
+import type { RequestHandler } from './$types';
+
+/** Owner-only: mark / unmark an entry as seen (collected), optionally with a date and note. */
+export const POST: RequestHandler = async (event) => {
+	if (!isOwner(event)) error(404, 'Not Found');
+	const body = parseSeenBody(await event.request.json().catch(() => null));
+	if (!body) error(400, 'Bad request');
+	const ok = await setSeen('planes', body.id, body.seen, body.seenOn, body.note);
+	if (!ok) error(404, 'No such entry');
+	return json({ ok: true, ...body });
+};
--- a/src/routes/trackers/trains/+page.server.ts
+++ b/src/routes/trackers/trains/+page.server.ts
@@ -1,24 +1,70 @@
 import { PAGE_SIZE, parseFilters, searchTrains, trainOverview } from '#lib/server/trains.js';
+import {
+	areasWithData,
+	groupActivity,
+	progress,
+	rankByActivity,
+	seenByGroup
+} from '#lib/server/spotting.js';
+import { regionOf } from '#lib/spotting/areas.js';
 import type { PageServerLoad } from './$types';

+const names = new Intl.DisplayNames(['en'], { type: 'region' });
+/** English country names (as stored on operators) inside an area. */
+const areaCountries = (area: string) =>
+	new Set(
+		(regionOf(area)?.countries ?? [area]).map((c) => {
+			try {
+				return names.of(c.toUpperCase()) ?? c;
+			} catch {
+				return c;
+			}
+		})
+	);
+
 export const load: PageServerLoad = async ({ url }) => {
 	const filters = parseFilters(url.searchParams);
-	const [{ trains, total }, overview] = await Promise.all([searchTrains(filters), trainOverview()]);
+	const [{ trains, total }, overview, collected, seenMakers, areas, act] = await Promise.all([
+		searchTrains(filters),
+		trainOverview(),
+		progress('trains'),
+		seenByGroup('trains'),
+		areasWithData('trains'),
+		groupActivity('trains', filters.area)
+	]);
+	const home = areaCountries(filters.area);
 	return {
 		filters,
 		trains,
 		total,
 		pageSize: PAGE_SIZE,
+		collected,
+		areas,
 		makers: overview.makers
 			.filter((m) => m.types >= 2 || m.slug === filters.maker)
 			.map(({ slug, name, types }) => ({ slug, name, types })),
 		countries: overview.countries
 			.filter((c) => c.types >= 3 || c.name === filters.country)
 			.map(({ name, types }) => ({ name, types })),
-		topMakers: overview.byBuilt
+		topMakers: rankByActivity(overview.byBuilt, act)
 			.slice(0, 16)
-			.map(({ slug, name, types, built, logo }) => ({ slug, name, types, built, logo })),
-		topOperators: overview.operators.slice(0, 16).map(({ slug, name, types, logo }) => ({
+			.map(({ id, slug, name, types, built, logo }) => ({
+				slug,
+				name,
+				types,
+				built,
+				logo,
+				seen: seenMakers.get(id) ?? 0
+			})),
+		// Operators from the chosen area first (the world region keeps the plain fleet-size order).
+		topOperators: (filters.area === 'world'
+			? overview.operators
+			: [...overview.operators].sort(
+					(a, b) => Number(home.has(b.country ?? '')) - Number(home.has(a.country ?? ''))
+				)
+		)
+			.slice(0, 16)
+			.map(({ slug, name, types, logo }) => ({
 				slug,
 				name,
 				types,
--- a/src/routes/trackers/trains/+page.svelte
+++ b/src/routes/trackers/trains/+page.svelte
@@ -15,6 +15,10 @@
 		TRACTIONS,
 		tractionLabel
 	} from '#lib/trains/shared.js';
+	import AreaSelect from '#lib/spotting/AreaSelect.svelte';
+	import { GOT } from '#lib/spotting/areas.js';
+	import SpotItem from '#lib/spotting/SpotItem.svelte';
+	import SpotProgress from '#lib/spotting/SpotProgress.svelte';
 	import { Input } from '#lib/components/ui/input/index.js';
 	import { NativeSelect } from '#lib/components/ui/native-select/index.js';
 	import Search from 'lucide-svelte/icons/search';
@@ -27,7 +31,7 @@
 	const f = $derived(data.filters);
 	const pages = $derived(Math.max(1, Math.ceil(data.total / data.pageSize)));
 	const filtering = $derived(
-		!!(f.q || f.maker || f.category || f.traction || f.country || f.era || f.service)
+		!!(f.q || f.maker || f.category || f.traction || f.country || f.era || f.service || f.got)
 	);

 	let form: HTMLFormElement | undefined = $state();
@@ -61,7 +65,8 @@
 		{ label: '🚇 metros', params: { category: 'metro', sort: 'built' } },
 		{ label: '🚋 trams', params: { category: 'tram', sort: 'built' } },
 		{ label: '💪 most powerful', params: { sort: 'power' } },
-		{ label: '🟡 VIRM', params: { q: 'virm' } }
+		{ label: '🟡 VIRM', params: { q: 'virm' } },
+		{ label: '⬜ still to go', params: { got: 'no' } }
 	];
 </script>

@@ -107,6 +112,15 @@
 		</div>
 	</dl>

+	<div class="mb-8">
+		<SpotProgress
+			seen={data.collected.seen}
+			total={data.collected.total}
+			label="types collected"
+			href={withParams({ got: 'no' })}
+		/>
+	</div>
+
 	{#if !filtering && f.page === 1}
 		<section class="mb-8" aria-labelledby="makers-heading">
 			<div class="mb-3 flex items-baseline justify-between gap-3">
@@ -194,6 +208,14 @@
 				{#each Object.entries(SORTS) as [key, label] (key)}<option value={key}>{label}</option
 					>{/each}
 			</NativeSelect>
+			{#if f.sort === 'active'}<AreaSelect
+					value={f.area}
+					available={data.areas}
+					onchange={submit}
+				/>{/if}
+			<NativeSelect name="got" aria-label="Collection" value={f.got} onchange={submit}>
+				{#each Object.entries(GOT) as [key, label] (key)}<option value={key}>{label}</option>{/each}
+			</NativeSelect>
 			<noscript><button type="submit" class="pill">search</button></noscript>
 		</div>
 	</form>
@@ -216,7 +238,11 @@
 	{#if data.trains.length}
 		<ul class="grid">
 			{#each data.trains as train, i (train.dex)}
-				<li><TrainCard {train} eager={i < 4} /></li>
+				<li>
+					<SpotItem tracker="trains" id={train.id} seen={train.seen} label={train.fullName}>
+						<TrainCard {train} eager={i < 4} />
+					</SpotItem>
+				</li>
 			{/each}
 		</ul>
 	{:else}
--- a/src/routes/trackers/trains/[maker]/+page.svelte
+++ b/src/routes/trackers/trains/[maker]/+page.svelte
@@ -11,10 +11,17 @@
 		thumbSrcset
 	} from '#lib/trains/shared.js';
 	import ArrowLeft from 'lucide-svelte/icons/arrow-left';
+	import { page } from '$app/state';
+	import { parseGot } from '#lib/spotting/areas.js';
+	import { countSeen, filterGot } from '#lib/spotting/seen.svelte.js';
+	import SpotItem from '#lib/spotting/SpotItem.svelte';
+	import SpotProgress from '#lib/spotting/SpotProgress.svelte';
 	import type { PageProps } from './$types';

 	let { data }: PageProps = $props();
 	const b = $derived(data.maker);
+	const got = $derived(parseGot(page.url.searchParams.get('got')));
+	const shown = $derived(filterGot('trains', data.types, got));
 </script>

 <div class="mx-auto max-w-6xl px-4 py-12 sm:px-6 sm:py-16">
@@ -61,9 +68,21 @@
 		</div>
 	</header>

+	<div class="mb-6">
+		<SpotProgress
+			seen={countSeen('trains', data.types)}
+			total={data.types.length}
+			label="{b.name} types collected"
+			{got}
+		/>
+	</div>
 	<ul class="grid">
-		{#each data.types as train, i (train.dex)}
-			<li><TrainCard {train} eager={i < 4} /></li>
+		{#each shown as train, i (train.dex)}
+			<li>
+				<SpotItem tracker="trains" id={train.id} seen={train.seen} label={train.fullName}>
+					<TrainCard {train} eager={i < 4} />
+				</SpotItem>
+			</li>
 		{/each}
 	</ul>
 	<p class="mt-10 text-xs text-[var(--site-muted)]">
--- a/src/routes/trackers/trains/[maker]/[type]/+page.server.ts
+++ b/src/routes/trackers/trains/[maker]/[type]/+page.server.ts
@@ -1,6 +1,7 @@
 import { error } from '@sveltejs/kit';
 import { getType } from '#lib/server/trains.js';
 import type { trainTypes } from '#lib/server/db/schema/index.js';
+import { getSeen } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 type Type = typeof trainTypes.$inferSelect;
@@ -28,12 +29,14 @@ export const load: PageServerLoad = async ({ params }) => {
 	const found = await getType(params.maker, params.type);
 	if (!found) error(404, 'No such train in the pokedex');
 	const { type, maker, photos, parent, variants, operators, prev, next } = found;
+	const seenEntry = await getSeen('trains', type.id);
 	const strip = <T extends { id: number }>(row: T): Omit<T, 'id'> => {
 		const rest: Partial<T> = { ...row };
 		delete rest.id;
 		return rest as Omit<T, 'id'>;
 	};
 	return {
+		spot: { id: type.id, entry: seenEntry },
 		train: publicType(type),
 		maker: { slug: maker.slug, name: maker.name, country: maker.country, logo: maker.logo },
 		photos,
--- a/src/routes/trackers/trains/[maker]/[type]/+page.svelte
+++ b/src/routes/trackers/trains/[maker]/[type]/+page.svelte
@@ -20,6 +20,7 @@
 	import ChevronLeft from 'lucide-svelte/icons/chevron-left';
 	import ChevronRight from 'lucide-svelte/icons/chevron-right';
 	import Shuffle from 'lucide-svelte/icons/shuffle';
+	import SeenPanel from '#lib/spotting/SeenPanel.svelte';
 	import type { PageProps } from './$types';

 	let { data }: PageProps = $props();
@@ -222,6 +223,7 @@
 				>{:else if p.inService === false}<span class="chip">retired</span>{/if}
 		</div>
 	</header>
+	<SeenPanel tracker="trains" id={data.spot.id} entry={data.spot.entry} label="this one" />

 	{#if data.photos.length}
 		<Gallery photos={data.photos} name={p.fullName} wikipedia={p.wikipedia} />
--- a/src/routes/trackers/trains/countries/[country]/+page.svelte
+++ b/src/routes/trackers/trains/countries/[country]/+page.svelte
@@ -9,13 +9,19 @@
 		type TrainCard as Card
 	} from '#lib/trains/shared.js';
 	import ArrowLeft from 'lucide-svelte/icons/arrow-left';
+	import { page } from '$app/state';
+	import { parseGot } from '#lib/spotting/areas.js';
+	import { countSeen, filterGot } from '#lib/spotting/seen.svelte.js';
+	import SpotItem from '#lib/spotting/SpotItem.svelte';
+	import SpotProgress from '#lib/spotting/SpotProgress.svelte';
 	import type { PageProps } from './$types';

 	let { data }: PageProps = $props();
+	const got = $derived(parseGot(page.url.searchParams.get('got')));
 	const groups = $derived(
 		CATEGORIES.map((cat) => ({
 			cat,
-			types: data.types.filter((t: Card) => t.category === cat)
+			types: filterGot('trains', data.types, got).filter((t: Card) => t.category === cat)
 		})).filter((g) => g.types.length)
 	);
 </script>
@@ -42,6 +48,14 @@
 			{/each}
 		</nav>
 	</header>
+	<div class="mb-8">
+		<SpotProgress
+			seen={countSeen('trains', data.types)}
+			total={data.types.length}
+			label="types collected"
+			{got}
+		/>
+	</div>

 	{#each groups as g, gi (g.cat)}
 		<section class="mb-10" id={g.cat.replace(/ /g, '-')}>
@@ -52,7 +66,11 @@
 			</h2>
 			<ul class="grid">
 				{#each g.types as train, i (train.dex)}
-					<li><TrainCard {train} eager={gi === 0 && i < 4} /></li>
+					<li>
+						<SpotItem tracker="trains" id={train.id} seen={train.seen} label={train.fullName}>
+							<TrainCard {train} eager={gi === 0 && i < 4} />
+						</SpotItem>
+					</li>
 				{/each}
 			</ul>
 		</section>
--- a/src/routes/trackers/trains/makers/+page.server.ts
+++ b/src/routes/trackers/trains/makers/+page.server.ts
@@ -1,10 +1,12 @@
 import { trainOverview } from '#lib/server/trains.js';
+import { seenByGroup } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 export const load: PageServerLoad = async () => {
-	const { byBuilt, stats } = await trainOverview();
+	const [{ byBuilt, stats }, seen] = await Promise.all([trainOverview(), seenByGroup('trains')]);
 	return {
-		makers: byBuilt.map(({ slug, name, types, built, logo }) => ({
+		makers: byBuilt.map(({ id, slug, name, types, built, logo }) => ({
+			seen: seen.get(id) ?? 0,
 			slug,
 			name,
 			types,
--- a/src/routes/trackers/trains/operators/[operator]/+page.svelte
+++ b/src/routes/trackers/trains/operators/[operator]/+page.svelte
@@ -10,10 +10,17 @@
 		thumbSrcset
 	} from '#lib/trains/shared.js';
 	import ArrowLeft from 'lucide-svelte/icons/arrow-left';
+	import { page } from '$app/state';
+	import { parseGot } from '#lib/spotting/areas.js';
+	import { countSeen, filterGot } from '#lib/spotting/seen.svelte.js';
+	import SpotItem from '#lib/spotting/SpotItem.svelte';
+	import SpotProgress from '#lib/spotting/SpotProgress.svelte';
 	import type { PageProps } from './$types';

 	let { data }: PageProps = $props();
 	const b = $derived(data.operator);
+	const got = $derived(parseGot(page.url.searchParams.get('got')));
+	const shown = $derived(filterGot('trains', data.types, got));
 </script>

 <div class="mx-auto max-w-6xl px-4 py-12 sm:px-6 sm:py-16">
@@ -58,9 +65,21 @@
 		</div>
 	</header>

+	<div class="mb-6">
+		<SpotProgress
+			seen={countSeen('trains', data.types)}
+			total={data.types.length}
+			label="{b.name} types collected"
+			{got}
+		/>
+	</div>
 	<ul class="grid">
-		{#each data.types as train, i (train.dex)}
-			<li><TrainCard {train} eager={i < 4} /></li>
+		{#each shown as train, i (train.dex)}
+			<li>
+				<SpotItem tracker="trains" id={train.id} seen={train.seen} label={train.fullName}>
+					<TrainCard {train} eager={i < 4} />
+				</SpotItem>
+			</li>
 		{/each}
 	</ul>
 	<p class="mt-10 text-xs text-[var(--site-muted)]">
--- a/src/routes/trackers/trains/seen/+server.ts
+++ b/src/routes/trackers/trains/seen/+server.ts
@@ -0,0 +1,14 @@
+import { error, json } from '@sveltejs/kit';
+import { isOwner } from '#lib/server/owner.js';
+import { parseSeenBody, setSeen } from '#lib/server/spotting.js';
+import type { RequestHandler } from './$types';
+
+/** Owner-only: mark / unmark an entry as seen (collected), optionally with a date and note. */
+export const POST: RequestHandler = async (event) => {
+	if (!isOwner(event)) error(404, 'Not Found');
+	const body = parseSeenBody(await event.request.json().catch(() => null));
+	if (!body) error(400, 'Bad request');
+	const ok = await setSeen('trains', body.id, body.seen, body.seenOn, body.note);
+	if (!ok) error(404, 'No such entry');
+	return json({ ok: true, ...body });
+};
--- a/src/routes/trackers/wildlife/+page.server.ts
+++ b/src/routes/trackers/wildlife/+page.server.ts
@@ -1,18 +1,24 @@
 import { PAGE_SIZE, parseFilters, searchSpecies, wildlifeOverview } from '#lib/server/wildlife.js';
+import { areasWithData, progress, seenByGroup } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 export const load: PageServerLoad = async ({ url }) => {
 	const filters = parseFilters(url.searchParams);
-	const [{ species, total }, overview] = await Promise.all([
+	const [{ species, total }, overview, collected, seenGroups, areas] = await Promise.all([
 		searchSpecies(filters),
-		wildlifeOverview()
+		wildlifeOverview(),
+		progress('wildlife'),
+		seenByGroup('wildlife'),
+		areasWithData('wildlife')
 	]);
 	return {
 		filters,
 		species,
 		total,
 		pageSize: PAGE_SIZE,
-		groups: overview.groups,
+		collected,
+		areas,
+		groups: overview.groups.map((g) => ({ ...g, seen: seenGroups.get(g.id) ?? 0 })),
 		stats: overview.stats,
 		seo: {
 			title: 'Wildlife pokedex',
--- a/src/routes/trackers/wildlife/+page.svelte
+++ b/src/routes/trackers/wildlife/+page.svelte
@@ -7,7 +7,9 @@

 	let { data }: PageProps = $props();
 	const f = $derived(data.filters);
-	const filtering = $derived(!!(f.q || f.group || f.status || f.where || f.sort !== 'nl'));
+	const filtering = $derived(
+		!!(f.q || f.group || f.status || f.where || f.got || f.sort !== 'active')
+	);

 	const quick: { label: string; params: Record<string, string> }[] = [
 		{ label: '📖 dex order', params: { sort: 'dex' } },
@@ -79,6 +81,8 @@
 		pageSize={data.pageSize}
 		groups={data.groups}
 		{quick}
+		areas={data.areas}
+		collected={data.collected}
 	/>

 	<footer class="mt-12 text-xs leading-relaxed text-[var(--site-muted)]">
--- a/src/routes/trackers/wildlife/[group]/+page.server.ts
+++ b/src/routes/trackers/wildlife/[group]/+page.server.ts
@@ -1,12 +1,17 @@
 import { error } from '@sveltejs/kit';
 import { getGroup, PAGE_SIZE, parseFilters, searchSpecies } from '#lib/server/wildlife.js';
+import { areasWithData, groupProgress } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 export const load: PageServerLoad = async ({ params, url }) => {
 	const group = await getGroup(params.group);
 	if (!group) error(404, 'No such group in the wildlife pokedex');
 	const filters = parseFilters(url.searchParams, group.slug);
-	const { species, total } = await searchSpecies(filters);
+	const [{ species, total }, collected, areas] = await Promise.all([
+		searchSpecies(filters),
+		groupProgress('wildlife', group.id),
+		areasWithData('wildlife')
+	]);
 	return {
 		group: {
 			slug: group.slug,
@@ -18,6 +23,8 @@ export const load: PageServerLoad = async ({ params, url }) => {
 			photo: group.photo
 		},
 		filters,
+		collected,
+		areas,
 		species,
 		total,
 		pageSize: PAGE_SIZE,
--- a/src/routes/trackers/wildlife/[group]/+page.svelte
+++ b/src/routes/trackers/wildlife/[group]/+page.svelte
@@ -41,6 +41,9 @@
 		total={data.total}
 		pageSize={data.pageSize}
 		{quick}
+		areas={data.areas}
+		collected={data.collected}
+		collectedLabel="{g.name.toLowerCase()} collected"
 	/>
 </div>

--- a/src/routes/trackers/wildlife/[group]/[species]/+page.server.ts
+++ b/src/routes/trackers/wildlife/[group]/[species]/+page.server.ts
@@ -1,17 +1,20 @@
 import { error } from '@sveltejs/kit';
 import { getSpecies } from '#lib/server/wildlife.js';
 import { displayName, photoAt } from '#lib/wildlife/shared.js';
+import { getSeen } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 export const load: PageServerLoad = async ({ params }) => {
 	const found = await getSpecies(params.group, params.species);
 	if (!found) error(404, 'No such animal in the wildlife pokedex');
 	const { species: s, group, photos, relatives, prev, next } = found;
+	const seenEntry = await getSeen('wildlife', s.id);
 	const name = displayName(s);
 	const alt = [s.nameNl && s.nameNl !== name ? s.nameNl : null, s.scientificName]
 		.filter(Boolean)
 		.join(', ');
 	return {
+		spot: { id: s.id, entry: seenEntry },
 		species: {
 			dex: s.dex,
 			slug: s.slug,
--- a/src/routes/trackers/wildlife/[group]/[species]/+page.svelte
+++ b/src/routes/trackers/wildlife/[group]/[species]/+page.svelte
@@ -14,6 +14,7 @@
 	import ChevronLeft from 'lucide-svelte/icons/chevron-left';
 	import ChevronRight from 'lucide-svelte/icons/chevron-right';
 	import Shuffle from 'lucide-svelte/icons/shuffle';
+	import SeenPanel from '#lib/spotting/SeenPanel.svelte';
 	import type { PageProps } from './$types';

 	let { data }: PageProps = $props();
@@ -165,6 +166,7 @@
 			{#if s.extinct}<span class="chip">🪦 extinct</span>{/if}
 		</div>
 	</header>
+	<SeenPanel tracker="wildlife" id={data.spot.id} entry={data.spot.entry} label="this one" />

 	{#if data.photos.length}
 		<Gallery photos={data.photos} {name} />
--- a/src/routes/trackers/wildlife/groups/+page.server.ts
+++ b/src/routes/trackers/wildlife/groups/+page.server.ts
@@ -1,10 +1,14 @@
 import { wildlifeOverview } from '#lib/server/wildlife.js';
+import { seenByGroup } from '#lib/server/spotting.js';
 import type { PageServerLoad } from './$types';

 export const load: PageServerLoad = async () => {
-	const { groups, stats } = await wildlifeOverview();
+	const [{ groups, stats }, seen] = await Promise.all([
+		wildlifeOverview(),
+		seenByGroup('wildlife')
+	]);
 	return {
-		groups,
+		groups: groups.map((g) => ({ ...g, seen: seen.get(g.id) ?? 0 })),
 		stats,
 		seo: {
 			title: 'Wildlife groups',
--- a/src/routes/trackers/wildlife/seen/+server.ts
+++ b/src/routes/trackers/wildlife/seen/+server.ts
@@ -0,0 +1,14 @@
+import { error, json } from '@sveltejs/kit';
+import { isOwner } from '#lib/server/owner.js';
+import { parseSeenBody, setSeen } from '#lib/server/spotting.js';
+import type { RequestHandler } from './$types';
+
+/** Owner-only: mark / unmark an entry as seen (collected), optionally with a date and note. */
+export const POST: RequestHandler = async (event) => {
+	if (!isOwner(event)) error(404, 'Not Found');
+	const body = parseSeenBody(await event.request.json().catch(() => null));
+	if (!body) error(400, 'Bad request');
+	const ok = await setSeen('wildlife', body.id, body.seen, body.seenOn, body.note);
+	if (!ok) error(404, 'No such entry');
+	return json({ ok: true, ...body });
+};