The Global Navigation Satellite System (GNSS) has become essential across multiple sectors, with the majority recognizing it via the American GPS constellation. Nevertheless, it isn’t confined to GPS alone; the European Galileo, Russian GLONASS, and Chinese BeiDou are also components of this vast system. Contemporary receivers frequently merge signals from all these constellations.
These signals are remarkably weak. Satellites function approximately 20,000 kilometers above the Earth, transmitting at around 27 watts—the equivalent power of a small light bulb. Once this signal arrives on Earth, it has diminished considerably. Picture detecting a lit bulb over the Atlantic Ocean from a chair in Warsaw; that illustrates the level of faintness we face.
Such weak signals are prone to disruption. Since the Russian incursion into Ukraine in February 2022, GNSS interference within European airspace, particularly around the Baltic and Black Seas, has surged.
The Mechanism
GNSS operates by gauging precise arrival times. Satellites house atomic clocks and consistently dispatch timestamped identity signals. A receiver situated on Earth gathers signals from four or more satellites, compares their arrival times, calculates distances, and determines a three-dimensional positional fix. Besides assisting navigation, this system is vital for high-precision time synchronization among networks dependent on coordinated timekeeping.
Two main interference methods impact European airspace. The European Union Aviation Safety Agency’s Safety Information Bulletin 2022-02R4 delineates them: jamming and spoofing. Jamming emits broadband radio noise on satellite frequencies, overpowering weak satellite signals, which leads receivers to lose the signal but fail safely. Spoofing transmits counterfeit satellite signals, deceiving receivers into locking onto false data, generating incorrect position fixes while remaining unaware of the trickery.
What is Happening Over Europe
Organizations such as EASA, EUROCONTROL, IATA, and the Council of the European Union have comprehensively documented GNSS interference. Since August 2024, incidents in the Baltic, Mediterranean, Middle East, Black Sea, and Arctic regions have surged. IATA indicates that GPS signal loss occurrences rose by 220% from 2021 to 2024. EUROCONTROL mentions in IATA’s Safety Risk Assessment that, by August 2024, about 1,500 daily flights faced spoofing attacks, largely attributed to sources in Russia and Belarus.
Operational accounts from airline crews and ground systems report problems such as incoherent navigation positions, abnormal discrepancies between ground speed and true airspeed, abrupt changes in flight management system time/date, inaccurate terrain warnings, loss of Airborne Collision Avoidance System capabilities, and flight diversions or missed approaches. In one instance, a plane was diverted after instruments indicated false position data during landing in Vilnius, Lithuania, with no mechanical faults found.
The Four Domains
Aviation is profoundly influenced, but not exclusively. GNSS offers two services: location and precise timing. Financial systems depend on GNSS time signals for transaction timestamps. Regulatory requirements in the EU necessitate timestamps accurate within 100 microseconds of Coordinated Universal Time; GNSS assists in achieving this benchmark.
Electrical grids utilize GNSS time signals to synchronize AC phases across regions. Extended spoofing could destabilize grids, posing risks of cascading failures. Mobile networks utilize GNSS for tower handoff coordination, and GNSS disruption can impact emergency services, logistics, agriculture, construction, and drone operations.
The Regulatory Response
Characterized as a hybrid warfare risk, GNSS interference has elicited a response from the EU. On June 6, 2025, 13 EU Member States called for coordinated action from the European Commission. EASA and EUROCONTROL unveiled a joint initiative in March 2026, addressing human performance, management, aircraft design, and infrastructure, with measures including enhanced reporting, control over jamming device exports, improved technical mitigations, and support for traditional navigation aids.
Baltic nations have accused Russia of instigating these disruptions, which Russia has denied. The International Civil Aviation Organization is observing this as a threat to aviation safety and intends to establish standards for managing GNSS interference.
What the Case Shows
The vulnerability exploited in Europe is not a defect in GNSS design but a conscious choice for an unencrypted, unauthenticated signal that establishes global positioning. While it has fostered the positioning revolution, it also leaves systems vulnerable to spoofing. New systems like Galileo incorporate authentication to combat spoofing, but many receivers lack these capabilities, making the transition gradual.
With modern society heavily dependent on these signals and intentional interference taking place, the costs and the necessity for mitigations are evident. The discourse surrounding reliance on an unverified signal continues, particularly in conflict-adjacent regions like the Baltic Sea.