{"type": "FeatureCollection", "_meta": {"__meta__": "synthetic", "disclaimer": "Synthetic demo data inspired by real Baltic geography, MMSI/OUI conventions, and infrastructure. Not real observations.", "dataset": "s4-spoofed-ais-identity/silakka_decoy_route", "version": "1.0"}, "features": [{"type": "Feature", "properties": {"featureId": "silakka-transit", "name": "F/V SILAKKA Porkkala -> Helsinki transit (decoy, clean)", "mmsi": 230888022}, "geometry": {"type": "LineString", "coordinates": [[24.42, 59.985], [24.62, 60.03], [24.94, 60.15], [24.952, 60.166]]}}]}