The Gulf of Finland is the easternmost arm of the Baltic Sea, separating Estonia (south shore) from Finland (north shore), and closed to the east by the Russian coast at the head of the gulf. It is one of Europe's busiest shipping lanes — tankers routing from St. Petersburg and other Russian Baltic ports pass through daily — and has been the site of repeated GPS-spoofing and AIS-interference reports along the Russian side.
On AirVeto, the Gulf of Finland is where AIS tracking (via Digitraffic) is most informative. Vessel density in the main shipping lane is high enough that unusual track behaviour — sudden position jumps, vessels appearing stationary in the middle of the lane, AIS transmissions that disagree with wind/current-consistent drift — stands out against the baseline. Combine AIS with the rendered wind field at the sea-surface altitude to cross-check whether reported drift patterns are physically consistent.
Wind in the gulf is altitude-sensitive in a characteristic way: surface flow is shaped by the narrow channel and coastal terrain, while the 1,500–3,000 m field is closer to the regional synoptic pattern. Questions about coastal ship navigation care about the former; questions about regional airflow between Estonia and Russia care about the latter.
Methodology: see /about/methodology. AirVeto is not for aviation, navigation, or safety-critical decisions.