Fake GPS Signals Hit Baltic Shipping

A cargo vessel in the Gulf of Finland checks its position display. The coordinates look right. The heading looks right. Speed over ground, the ship's pace against the seabed, looks right too. The screen is green. The position is wrong.

That is the danger with spoofing. Jamming is crude: it floods the receiver with noise, the signal disappears, and the crew know they have a problem. Spoofing is more dangerous because it lies convincingly. It sends a fake satellite signal that tells the receiver it is somewhere else, while the equipment still appears to be working (Dryad Global). Swedish authorities say this is becoming more systematic across the Baltic, with crews facing not only missing signals but false ones that look real (SVT).

The affected zone runs from south-eastern Sweden and Gotland across routes towards Finland, Poland and the Baltic states. Security assessments point towards Russia. Crisis24 says Moscow is likely to keep using GPS interference in the Baltic as electronic warfare that spills into civilian life (Crisis24). EUSPA's executive director has also said Europe is facing very high interference along its eastern border, affecting both GPS and Europe's Galileo satellites (EUPerspectives). But the public evidence still has a gap: there is no open technical file linking 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 standing warnings in place. GPS may be unreliable across the Riga flight region, and pilots are told to rely on radar guidance from controllers and older ground-based navigation beacons (Latvia NOTAM). For passengers, this does not mean aircraft simply dropping out of the sky. It means fewer approach options, more work in the cockpit and, in some cases, rerouting (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 afford to trust one position feed in crowded lanes or on the approach to port. They go back to older disciplines: plotting radar contacts, checking bearings against visible landmarks, slowing down. Anyone used to Malta's Grand Harbour or the approaches around Marsaxlokk will understand the point. In tight water, uncertainty is not theoretical. It changes how a vessel moves.

Finland is feeling this most sharply. Its Border Guard has warned of strong GPS interference in the Gulf of Finland, while Norwegian authorities have detected a newer form of interference already under investigation there (Yle, Yle). For ferry operators and coastal traffic, disruption becomes part of the working day: lower speeds near ports, more watchkeeping hours, and the quiet pressure of knowing the instruments may be lying.

Old fallbacks, slow upgrades

Europe's first defence is not glamorous. It is navigation warnings, ground-based beacons, manual cross-checking and better incident reporting. EUROCONTROL, which coordinates European air traffic, monitors aircraft position data to map where satellite signals are degrading across the network (EUROCONTROL). Poland's geodetic authority has signed a cooperation agreement on real-time satellite-signal analysis, building the ability to distinguish ordinary signal loss from deliberate interference (gov.pl).

The clearest technical upgrade is a Galileo feature called OSNMA, effectively a digital watermark on navigation signals. It lets a receiver check whether a signal really came from a satellite, rather than from someone on the ground pretending to be one (EUSPA). The problem is deployment. Aircraft, ships and vehicles already in service need compatible receivers, and replacing or upgrading that equipment takes years.

Modern transport, emergency services and infrastructure timing all depend on satellite signals built for a world where few people thought it worthwhile to fake them. The Baltic is where that assumption has failed. The defences are being built, but the interference is already part of daily operations. A spoofed screen does not announce itself. It just shows the wrong place with confidence.