Quick summary
Bulgarian security forces neutralized a high-power GPS jammer in the Dragalevtsi district of Sofia on August 21, 2026, after the device had been suppressing satellite navigation signals used by Sofia Airport, overflying aircraft, and television towers. The operation was a joint effort by the State Agency for National Security (DANS), the Communications Regulation Commission, and Sofia’s Directorate of the Interior. No arrests were made and no owner has been identified.
Commercial pilot and aviation journalist Aleksandar Bogoyavlenski reported that aircraft at Sofia experienced near-continuous GPS signal loss for at least three days before the jammer was shut down. Flights continued on schedule — but the device’s location inside a guarded complex and the absence of any attribution leave the most important questions unanswered.
A powerful GPS jammer operated undetected inside a fortified compound in Sofia for days before Bulgarian authorities moved in — and when they did, nobody was arrested.
DANS, Bulgaria’s national security agency, confirmed on August 21, 2026 that the device had been located and neutralized in the Dragalevtsi residential district, roughly five kilometers from Sofia Airport (SOF). The jammer had been suppressing the GPS frequencies that aircraft, air traffic controllers, and broadcast towers all depend on. Transport and Communications Minister Georgi Peev stated that satellite navigation was compromised and that flight management was affected, though he maintained that safety was not at risk.
That safety claim holds up — aircraft switched to Bulgaria’s conventional terrestrial navigation network and continued operating normally. What it does not resolve is who built the device, who guarded it, and why it ran for at least three days before anyone shut it down.
For travelers flying to, from, or across Bulgaria, the immediate threat is gone. The structural vulnerability it exposed is not. Eastern Europe has become the most GPS-contested airspace on the planet, and the Sofia incident is the latest evidence that deliberate interference has moved from occasional nuisance to persistent operational risk.
What happened in Dragalevtsi — and what remains unknown
The joint operation that neutralized the jammer was triggered by air traffic controllers who reported the interference, according to Bulgarian National Radio. DANS, the Communications Regulation Commission, and Sofia police then conducted the operation together. The device was found inside what official sources described as a heavily guarded complex — an unusual detail that points toward organized rather than opportunistic deployment.
Bulgarian authorities have not publicly identified the jammer’s owner or operator, and official security service statements confirm no arrests were made. Attribution remains an open investigative question. Unverified claims circulating online link the device to specific criminal figures, but no official Bulgarian body has confirmed any such connection, and those claims are excluded here.
The duration of the interference is the detail that most concerns aviation professionals. Bogoyavlenski, drawing on pilot reports, described the GPS signal over Sofia as disappearing almost continuously for at least three days before August 21. Sofia Airport’s press office confirmed that operations were not disrupted and flights ran on schedule throughout — a result of crews reverting to conventional VOR and ILS navigation rather than any failure of the jammer to cause harm.
This is not Bulgaria’s first encounter with deliberate GPS interference. Open-source monitoring flagged anomalies over Sofia as far back as August 2024, with further episodes in October 2024 and a GPS World-documented interference event running from December 2024 into January 2025. None of those earlier incidents have been formally linked to the Dragalevtsi device. Separately, a flight carrying European Commission President Ursula von der Leyen encountered GPS jamming while approaching Plovdiv Airport on August 31, 2025 — an incident in which Bulgarian authorities suspected Russian involvement, though no formal attribution was ever confirmed.
| Date | Location / Event | Duration / Status | Attribution |
|---|---|---|---|
| August 2024 | Sofia airspace (GPSJam anomalies) | Isolated episodes | None confirmed |
| October 2024 | Sofia airspace (GPSJam anomalies) | Isolated episodes | None confirmed |
| Dec 2024 – Jan 2025 | Sofia and surrounds | Multi-week (GPS World reported) | None confirmed |
| August 31, 2025 | Plovdiv Airport approach | Single flight (von der Leyen aircraft) | Russian involvement suspected; unconfirmed |
| Aug 18–21, 2026 | Dragalevtsi, Sofia (jammer active) | At least 3 days; neutralized Aug 21 | None confirmed; no arrests |
ICAO formally condemned recurring GNSS radio-frequency interference originating from Russia and North Korea at its October 2025 Assembly, framing deliberate jamming as a violation of the Chicago Convention. That condemnation carries diplomatic weight but no enforcement mechanism — which is precisely why a jammer can sit in a Sofia suburb for days before anyone acts.
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Why the system held — and what regulators are building to keep it that way
The fact that Sofia flights continued normally during three days of near-continuous GPS disruption is not luck. It reflects a deliberate design principle: commercial aircraft carry multiple independent navigation sources, and crews train to use them. When satellite signals degraded over Sofia, pilots and controllers shifted to Bulgaria’s terrestrial navaid network — VOR beacons, DME distance measuring equipment, and instrument landing systems that have no dependency on GPS whatsoever. The transition is procedural, not improvised.
What the Sofia incident does expose is the gap between operational resilience and regulatory preparedness. EASA and Eurocontrol published their European Aviation Action Plan on GNSS interference in early 2026, assigning specific responsibilities to national authorities, air navigation service providers, and airlines. The plan mandates common criteria for interference-related NOTAMs, standard cockpit phraseology, and national contingency procedures — exactly the framework that Bulgarian controllers were working without during the earlier, unattributed interference episodes of 2024 and 2025.
Three days is a long time for a high-power jammer to operate before detection triggers a response. Under the EASA–Eurocontrol framework, that timeline should compress: systematic monitoring and rapid information-sharing between states are core requirements, not optional enhancements. Whether Bulgaria’s implementation of those requirements was complete by August 2026 is a question the investigation will need to answer.
What Sofia-bound and Eastern Europe travelers should do now
The Dragalevtsi jammer is gone, but GPS interference remains a documented and recurring risk across Eastern European airspace — travelers flying the region in the coming weeks should take a few specific steps.
- Check flight status on departure day: GNSS interference can trigger procedural changes that affect departure sequencing or routing. Check your airline’s app or website on the morning of travel, particularly for early-morning or late-night departures when controller workload is lower and anomalies may take longer to surface.
- Allow connection buffer at Sofia: Even when flights operate on schedule, navigation-related procedural adjustments can add minutes to approach and taxi times. If you’re connecting through SOF, a minimum 90-minute connection is prudent until the investigation into the jammer’s origin concludes.
- Know your airline’s communication channels: Carriers with strong Eastern European operations — Wizz Air, Lufthansa group airlines, Bulgaria Air — issue real-time alerts when GNSS-related NOTAMs affect their routes. Subscribe to push notifications before you travel.
- Understand what “safety not affected” actually means: Officials’ assurances refer to the aircraft’s ability to navigate safely using backup systems. They do not mean GPS was functioning normally. If your flight’s GPS-dependent features — such as certain approach procedures or performance-based navigation routes — are unavailable, crews use alternatives. This is normal and expected.
- Monitor EASA GNSS interference advisories: EASA publishes guidance and updates on GNSS interference for the European region. Checking before travel to any Eastern European destination takes under two minutes and gives you the current operational picture.
Watch: Whether DANS or Bulgarian prosecutors announce any identification of the jammer’s owner or operator in the coming weeks. If attribution points to a state actor, expect EASA and the EU to escalate their diplomatic response significantly — and for airlines to receive updated GNSS contingency guidance specific to Bulgarian airspace.
Questions? Answers.
Was it safe to fly to or from Sofia Airport during the GPS jamming?
Bulgarian Transport Minister Georgi Peev confirmed that while satellite navigation was compromised and flight management was affected, safety was not at risk. Aircraft switched to conventional terrestrial navigation systems — VOR beacons and ILS — which operate independently of GPS. Sofia Airport confirmed that all flights continued on schedule throughout the interference period.
Who operated the GPS jammer found in Sofia, and were any arrests made?
As of August 24, 2026, no arrests have been made and no owner or operator has been publicly identified. Bulgarian security services confirmed the device was found inside a heavily guarded complex in the Dragalevtsi district, but official statements from DANS and the Communications Regulation Commission stop short of naming any individual, organization, or state actor. The investigation is ongoing.
Is GPS jamming a common problem for flights across Eastern Europe?
It has become increasingly routine. ICAO’s October 2025 Assembly formally condemned recurring GNSS interference traced to Russia and North Korea as violations of the Chicago Convention. Eurocontrol data describes interference as a regular occurrence across parts of European airspace, which is why EASA and Eurocontrol published a joint European Aviation Action Plan on GNSS interference in early 2026 — treating degraded satellite navigation as a scenario to be managed, not an exception.
What is the EASA–Eurocontrol GNSS action plan, and does it apply to Bulgaria?
The European Aviation Action Plan on GNSS interference, published in February 2026, applies across European airspace including Bulgaria. It assigns responsibilities to national authorities, air navigation service providers, and airlines for systematic interference monitoring, issuing standardized NOTAMs, maintaining contingency procedures for reverting to conventional navigation, and developing improved cockpit tools. Bulgaria’s DANS and aviation authorities are expected to implement these measures as part of the broader European framework.
