Britain warns shipowners in its Maritime Guidance Note (MGN 719) that satellite navigation systems are severely impacted by jamming and spoofing in busy global maritime regions including the Baltic Sea, Black Sea, Middle East Gulf, and parts of East Asia. This disruption affects satellite-derived positioning, navigation, and timing systems integral to critical shipboard and shore-based maritime systems such as ECDIS, AIS, autopilots, radar, gyrocompasses, GMDSS communications, vessel traffic services, and port management logistics. The UK Maritime and Coastguard Agency (MCA) estimates a seven-day loss of GNSS could cost the British maritime economy £1.5 billion, including £1.3 billion in port operations. The MCA urges vessels to identify vulnerable systems, conduct interference detection procedures, and regularly train crews in alternative navigation techniques like radar fixing, visual bearings, celestial navigation, and dead reckoning. Maritime intelligence firm Windward reports an average of 5,131 daily GPS jamming incidents in Q3 affecting over 124,000 vessels. Research indicates 14% of respondents have experienced unsafe situations due to GNSS interference. Incidents include tankers broadcasting false positions thousands of kilometers away and hundreds of impossible vessel position jumps in the Gulf of Oman. While the UK is investing in an eLoran terrestrial navigation backup expected by 2028-2030, this technological alternative is currently unavailable and ships must prepare for persistent GNSS unreliability.

Britain warns shipowners in its Maritime Guidance Note (MGN 719) that satellite navigation systems are severely impacted by jamming and spoofing in busy global maritime regions including the Baltic Sea, Black Sea, Middle East Gulf, and parts of East Asia. This disruption affects satellite-derived positioning, navigation, and timing systems integral to critical shipboard and shore-based maritime systems such as ECDIS, AIS, autopilots, radar, gyrocompasses, GMDSS communications, vessel traffic services, and port management logistics. The UK Maritime and Coastguard Agency (MCA) estimates a seven-day loss of GNSS could cost the British maritime economy £1.5 billion, including £1.3 billion in port operations. The MCA urges vessels to identify vulnerable systems, conduct interference detection procedures, and regularly train crews in alternative navigation techniques like radar fixing, visual bearings, celestial navigation, and dead reckoning. Maritime intelligence firm Windward reports an average of 5,131 daily GPS jamming incidents in Q3 affecting over 124,000 vessels. Research indicates 14% of respondents have experienced unsafe situations due to GNSS interference. Incidents include tankers broadcasting false positions thousands of kilometers away and hundreds of impossible vessel position jumps in the Gulf of Oman. While the UK is investing in an eLoran terrestrial navigation backup expected by 2028-2030, this technological alternative is currently unavailable and ships must prepare for persistent GNSS unreliability.