Fake GPS signals mislead Baltic shipping

A cargo vessel in the Gulf of Finland checks its position display. Coordinates, heading, speed over ground (the ship's pace relative to the seabed): everything reads normal. The screen is green. The position is wrong.

The crew has no alarm, no blank screen, no sign of trouble. That is what makes spoofing different from jamming. Jamming blasts noise so a receiver hears nothing; the screen goes dark and everyone knows the system is broken. Spoofing broadcasts a convincing fake signal that feeds the receiver a wrong location while looking entirely plausible (Dryad Global). Swedish authorities say this kind of manipulation is becoming more systematic across the Baltic, with crews dealing not just with missing signals but with false ones that look real (SVT).

The disruption zone stretches from south-eastern Sweden and Gotland through shipping lanes toward Finland, Poland and the Baltic states. Security assessments consistently point to Russia. Crisis24 judges that Moscow will continue GPS interference in the Baltic as electronic warfare with civilian spillover (Crisis24), and EUSPA's executive director has said Europe faces very high interference along its eastern border, affecting both GPS and Europe's own Galileo satellites (EUPerspectives). Yet no open technical dossier ties specific incidents to specific Russian emitters. Strong suspicion, thin forensic proof.

What pilots and ship crews actually deal with

Latvia's air traffic authority has issued standing warnings: GPS may be unreliable across the Riga flight region, and pilots should rely on radar guidance from controllers and older ground-based navigation beacons (Latvia NOTAM). For passengers, this does not mean planes falling from the sky. It means fewer available approach procedures, higher cockpit workload and potential reroutes (EASA).

At sea, Sweden's Maritime Administration has warned that interference affects GPS, vessel-tracking systems and radar across the Baltic and the Gulf of Finland (Swedish Maritime Administration). Ship crews cannot trust a single position feed in crowded sea lanes or narrow port approaches. They fall back on manual cross-checks: plotting radar contacts, taking visual bearings on landmarks, reducing speed. Even when nothing dramatic happens, the extra workload burns fuel and frays nerves.

Finland has felt the pressure most directly. Its Border Guard warned of strong GPS interference in the Gulf of Finland, and Norwegian authorities detected a newer form of interference already being investigated there (Yle, Yle). For ferry operators and coastal traffic, disruption is a daily condition: more cautious speeds near ports, extra watchkeeping hours, the quiet stress of knowing the instruments might be lying.

Old fallbacks, slow upgrades

Europe's first line of defence is low-tech: navigation warnings, ground-based beacons, manual cross-checking and better incident reporting. EUROCONTROL, the body coordinating European air traffic, monitors aircraft position data to map where signals degrade across the network (EUROCONTROL). Poland's geodetic authority has signed a cooperation agreement on real-time satellite-signal analysis, building the ability to tell normal degradation from deliberate interference (gov.pl).

The most concrete upgrade is a Galileo feature called OSNMA, essentially a digital watermark on navigation signals. It lets a receiver verify that a signal genuinely comes from a satellite rather than a ground-based impersonator (EUSPA). The catch: compatible receivers need to reach fleets of aircraft, ships and vehicles already in service, a process measured in years.

Modern transport, emergency services and infrastructure timing all depend on satellite signals designed for a world where nobody would bother faking them. The Baltic is where that assumption broke. The defences are coming, but the interference is already here. A spoofed screen does not scream for attention. It just quietly shows you the wrong place.