Fake GPS Disrupts Baltic Shipping

A cargo vessel in the Gulf of Finland glances at its position display. The coordinates are there. The heading is there. Speed over ground, meaning the ship's pace relative to the seabed, looks normal. The screen is green. The position is wrong.

There is no alarm for the crew, no dead screen, no obvious failure. That is the danger. Jamming is blunt: it floods a receiver with noise until it hears nothing, the screen fails, and everyone knows the system cannot be trusted. Spoofing is quieter and more deceptive. It sends a convincing false signal, giving the receiver a wrong location while everything appears plausible (Dryad Global). Swedish authorities say this kind of manipulation is becoming more systematic across the Baltic, with crews facing not only missing signals but false ones that look real (SVT).

The affected area runs from south-eastern Sweden and Gotland through shipping lanes towards Finland, Poland and the Baltic states. Security assessments repeatedly point towards Russia. Crisis24 judges that Moscow will keep using GPS interference in the Baltic as electronic warfare with civilian consequences (Crisis24), while EUSPA's executive director has said Europe is seeing very high levels of interference along its eastern border, affecting both GPS and Europe's own Galileo satellites (EUPerspectives). Still, no open technical dossier links specific incidents to specific Russian transmitters. The suspicion is strong. The forensic proof is thinner.

What pilots and ship crews actually deal with

Latvia's air traffic authority has issued standing warnings that GPS may be unreliable across the Riga flight region. Pilots are being told to rely on radar guidance from controllers and older ground-based navigation beacons (Latvia NOTAM). For passengers, this does not mean aircraft falling out of the sky. It means fewer available approach procedures, more pressure in the cockpit and possible reroutes (EASA).

At sea, Sweden's Maritime Administration has warned that interference is affecting GPS, vessel-tracking systems and radar across the Baltic and the Gulf of Finland (Swedish Maritime Administration). Ship crews cannot rely on a single position feed in busy sea lanes or tight port approaches. They go back to the older discipline: plotting radar contacts, taking visual bearings from landmarks, slowing down. Even when there is no incident, the extra work costs fuel and wears people down.

Finland has felt it most sharply. Its Border Guard has warned of strong GPS interference in the Gulf of Finland, and Norwegian authorities have detected a newer form of interference that is already under investigation there (Yle, Yle). For ferry operators and coastal traffic, disruption is not an occasional scare. It becomes part of the day's work: slower approaches near ports, more watchkeeping, and the constant unease of knowing the instruments may be lying.

Old fallbacks, slow upgrades

Europe's first defence is still low-tech: navigation warnings, ground-based beacons, manual cross-checks and better reporting of incidents. EUROCONTROL, which coordinates European air traffic, monitors aircraft position data to map where signals are degrading across the network (EUROCONTROL). Poland's geodetic authority has signed a cooperation agreement on real-time satellite-signal analysis, building the capacity to distinguish ordinary degradation from deliberate interference (gov.pl).

The clearest technical upgrade is a Galileo feature called OSNMA, effectively a digital watermark on navigation signals. It allows a receiver to verify that a signal really comes from a satellite rather than from someone on the ground pretending to be one (EUSPA). The difficulty is practical. Compatible receivers have to make their way into aircraft, ships and vehicles already in service, and that kind of replacement happens over years, not months.

Modern transport, emergency services and infrastructure timing all depend on satellite signals built for a world in which few people imagined anyone would bother faking them. The Baltic is where that assumption has given way. The defences are coming, but the interference is already part of daily operations. A spoofed screen does not demand attention. It calmly shows the wrong place.