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Signal
Submitted
Feb 1, 2026, 00:14 UTC
GPS interference on Finnish maritime waters near Russian border tripled in early 2025, linked to Russian GPS jamming using Glonass systems.
During the first five months of 2025, Finnish authorities recorded 54 cases of GPS signal interference at sea near the eastern Gulf of Finland, marking a threefold increase from prior years. Such interference mainly affects vessels using satellite navigation, disrupting traditional navigation methods. The Finnish Transport and Communications Agency also reported elevated GPS jamming in airspace over the Gulf of Finland, especially near St. Petersburg and southern Baltic areas, attributed to Russian electronic warfare activities using Glonass. Finnish military experts believe Russia deliberately jams GPS in this area to protect its strategic interests from Ukrainian attacks. Authorities emphasize that electronic chart plotters should not replace basic navigation tools as these disruptions increase in frequency.
Confidence: High
The report clearly describes aggressive GPS jamming incidents affecting maritime navigation primarily in Finnish waters near Russia, with attribution to Russian electronic warfare and use of Glonass. The event represents hostile interference against allied territory, hence aggressor classification with high confidence. No defense preparations are described.
Source URL
https://portalmorski.pl/zegluga/58358-liczba-przypadkow-zaklocen-gps-na-morzu-wzrosla-trzykrotnie
Published as a hybrid-warfare signal with a public source and reviewer-approved assessment bands. See the methodology for how records are assessed.
{
"id": "93902487-31dc-4d2a-b723-9abc1fc398bf",
"url": "https://portalmorski.pl/zegluga/58358-liczba-przypadkow-zaklocen-gps-na-morzu-wzrosla-trzykrotnie",
"source": "admin_quick",
"status": "approved",
"category": "Cyber & Information Warfare",
"subcategory": "Cyber Attacks",
"incident_type": "Unknown",
"country": "Finland",
"source_reliability": "C",
"info_credibility": "3",
"tags": [
"GPS jamming",
"Maritime security",
"Finland",
"Russia",
"Gulf of Finland",
"Glonass",
"Electronic warfare"
],
"nodes": [],
"countries": [],
"where_text": "Maritime",
"headline": null,
"description": "Between January and May 2025, there were 54 recorded cases of GPS signal interference on sea waters near the eastern part of the Gulf of Finland close to the Russian border, a threefold increase compared to previous years. The Finnish Border Guard and maritime transport authorities reported these disruptions affecting navigation, mainly targeting vessels relying on satellite navigation systems, particularly in the Gulf of Finland. The Finnish Transport and Communications Agency noted a significant rise in GPS jamming incidents in airspace, located near St. Petersburg and southern Baltic regions, linked to Russia's use of its Glonass satellite navigation system. Former Finnish military officials stated Russia aims to disrupt GPS in the Finnish region to hinder Ukrainian strikes on its strategic targets.",
"summary_short": "GPS interference on Finnish maritime waters near Russian border tripled in early 2025, linked to Russian GPS jamming using Glonass systems.",
"summary_extended": "During the first five months of 2025, Finnish authorities recorded 54 cases of GPS signal interference at sea near the eastern Gulf of Finland, marking a threefold increase from prior years. Such interference mainly affects vessels using satellite navigation, disrupting traditional navigation methods. The Finnish Transport and Communications Agency also reported elevated GPS jamming in airspace over the Gulf of Finland, especially near St. Petersburg and southern Baltic areas, attributed to Russian electronic warfare activities using Glonass. Finnish military experts believe Russia deliberately jams GPS in this area to protect its strategic interests from Ukrainian attacks. Authorities emphasize that electronic chart plotters should not replace basic navigation tools as these disruptions increase in frequency.",
"actor_primary": "Russia",
"target_primary": null,
"location_text": "Finland",
"location_region": null,
"location_coordinates_lat": 61.92411,
"location_coordinates_lon": 25.748151,
"location_precision": "Regional",
"is_aggressor_signal": true,
"signal_type": "HYBRID_SIGNAL",
"is_hybrid_war_signal": true,
"classification_complete": true,
"hybrid_signal_complete": true,
"classification_confidence": "High",
"classification_rationale": "The report clearly describes aggressive GPS jamming incidents affecting maritime navigation primarily in Finnish waters near Russia, with attribution to Russian electronic warfare and use of Glonass. The event represents hostile interference against allied territory, hence aggressor classification with high confidence. No defense preparations are described.",
"event_time_utc": "2025-01-01T00:00:00.000Z",
"end_time_utc": "2025-05-31T00:00:00.000Z",
"event_time_confidence": "pm24h",
"created_at": "2026-02-01T00:14:40.525Z",
"updated_at": "2026-11-08T22:55:58.782Z",
"reliability_band": "strong",
"location_precision_band": "regional",
"time_precision_band": "within_24h",
"severity_band": "moderate",
"attribution_confidence_band": "high",
"attribution_basis": "single_source"
}Source reliability
C
Info credibility
3
Event time
Jan 1, 2025, 00:00 UTC
End time
May 31, 2025, 00:00 UTC
Event time confidence
pm24h
Location
Finland
Primary actor
Russia
Country
Finland
Tags
GPS jamming, Maritime security, Finland, Russia, Gulf of Finland, Glonass, Electronic warfare
Signal
Submitted
Feb 1, 2026, 00:14 UTC
GPS interference on Finnish maritime waters near Russian border tripled in early 2025, linked to Russian GPS jamming using Glonass systems.
During the first five months of 2025, Finnish authorities recorded 54 cases of GPS signal interference at sea near the eastern Gulf of Finland, marking a threefold increase from prior years. Such interference mainly affects vessels using satellite navigation, disrupting traditional navigation methods. The Finnish Transport and Communications Agency also reported elevated GPS jamming in airspace over the Gulf of Finland, especially near St. Petersburg and southern Baltic areas, attributed to Russian electronic warfare activities using Glonass. Finnish military experts believe Russia deliberately jams GPS in this area to protect its strategic interests from Ukrainian attacks. Authorities emphasize that electronic chart plotters should not replace basic navigation tools as these disruptions increase in frequency.
Confidence: High
The report clearly describes aggressive GPS jamming incidents affecting maritime navigation primarily in Finnish waters near Russia, with attribution to Russian electronic warfare and use of Glonass. The event represents hostile interference against allied territory, hence aggressor classification with high confidence. No defense preparations are described.
Source URL
https://portalmorski.pl/zegluga/58358-liczba-przypadkow-zaklocen-gps-na-morzu-wzrosla-trzykrotnie
Published as a hybrid-warfare signal with a public source and reviewer-approved assessment bands. See the methodology for how records are assessed.
{
"id": "93902487-31dc-4d2a-b723-9abc1fc398bf",
"url": "https://portalmorski.pl/zegluga/58358-liczba-przypadkow-zaklocen-gps-na-morzu-wzrosla-trzykrotnie",
"source": "admin_quick",
"status": "approved",
"category": "Cyber & Information Warfare",
"subcategory": "Cyber Attacks",
"incident_type": "Unknown",
"country": "Finland",
"source_reliability": "C",
"info_credibility": "3",
"tags": [
"GPS jamming",
"Maritime security",
"Finland",
"Russia",
"Gulf of Finland",
"Glonass",
"Electronic warfare"
],
"nodes": [],
"countries": [],
"where_text": "Maritime",
"headline": null,
"description": "Between January and May 2025, there were 54 recorded cases of GPS signal interference on sea waters near the eastern part of the Gulf of Finland close to the Russian border, a threefold increase compared to previous years. The Finnish Border Guard and maritime transport authorities reported these disruptions affecting navigation, mainly targeting vessels relying on satellite navigation systems, particularly in the Gulf of Finland. The Finnish Transport and Communications Agency noted a significant rise in GPS jamming incidents in airspace, located near St. Petersburg and southern Baltic regions, linked to Russia's use of its Glonass satellite navigation system. Former Finnish military officials stated Russia aims to disrupt GPS in the Finnish region to hinder Ukrainian strikes on its strategic targets.",
"summary_short": "GPS interference on Finnish maritime waters near Russian border tripled in early 2025, linked to Russian GPS jamming using Glonass systems.",
"summary_extended": "During the first five months of 2025, Finnish authorities recorded 54 cases of GPS signal interference at sea near the eastern Gulf of Finland, marking a threefold increase from prior years. Such interference mainly affects vessels using satellite navigation, disrupting traditional navigation methods. The Finnish Transport and Communications Agency also reported elevated GPS jamming in airspace over the Gulf of Finland, especially near St. Petersburg and southern Baltic areas, attributed to Russian electronic warfare activities using Glonass. Finnish military experts believe Russia deliberately jams GPS in this area to protect its strategic interests from Ukrainian attacks. Authorities emphasize that electronic chart plotters should not replace basic navigation tools as these disruptions increase in frequency.",
"actor_primary": "Russia",
"target_primary": null,
"location_text": "Finland",
"location_region": null,
"location_coordinates_lat": 61.92411,
"location_coordinates_lon": 25.748151,
"location_precision": "Regional",
"is_aggressor_signal": true,
"signal_type": "HYBRID_SIGNAL",
"is_hybrid_war_signal": true,
"classification_complete": true,
"hybrid_signal_complete": true,
"classification_confidence": "High",
"classification_rationale": "The report clearly describes aggressive GPS jamming incidents affecting maritime navigation primarily in Finnish waters near Russia, with attribution to Russian electronic warfare and use of Glonass. The event represents hostile interference against allied territory, hence aggressor classification with high confidence. No defense preparations are described.",
"event_time_utc": "2025-01-01T00:00:00.000Z",
"end_time_utc": "2025-05-31T00:00:00.000Z",
"event_time_confidence": "pm24h",
"created_at": "2026-02-01T00:14:40.525Z",
"updated_at": "2026-11-08T22:55:58.782Z",
"reliability_band": "strong",
"location_precision_band": "regional",
"time_precision_band": "within_24h",
"severity_band": "moderate",
"attribution_confidence_band": "high",
"attribution_basis": "single_source"
}Source reliability
C
Info credibility
3
Event time
Jan 1, 2025, 00:00 UTC
End time
May 31, 2025, 00:00 UTC
Event time confidence
pm24h
Location
Finland
Primary actor
Russia
Country
Finland
Tags
GPS jamming, Maritime security, Finland, Russia, Gulf of Finland, Glonass, Electronic warfare