Active U.S. Maritime Advisories:

2018-014-GPS Interference-Eastern Mediterranean and Red Seas

This revised advisory cancels U.S. Maritime Advisory 2018-007

  1. Reference: U.S. Maritime Alerts 2018-004A, 2018-004B, 2018-008A.
  2. Issue: Multiple instances of significant GPS interference continue to be reported by vessels and aircraft operating in the Eastern Mediterranean Sea. These reports have been concentrated near Port Said, Egypt, the Suez Canal, and in the vicinity of the Republic of Cyprus. Additional instances of similar interference were reported in October 2018 near Jeddah Port, Saudi Arabia.  This interference is resulting in lost or otherwise altered GPS signals affecting bridge navigation, GPS-based timing and communications equipment.
  3. Guidance: Exercise caution when transiting these areas. The U.S. Coast Guard Navigation Center (NAVCEN) and NATO Shipping Center websites contain information regarding effective navigation practices for vessels experiencing GPS interference. The information reaffirms safe navigation practices when experiencing possible GPS disruption, provides useful details on reporting possible GPS disruption, and is intended to generate further discussions within the maritime community about other disruption mitigation practices and procedures. This guidance also recommends taking note of critical information such as the location (latitude/longitude), date/time, and duration of the outage/disruption, and providing photographs or screen shots of equipment failures during a disruption to facilitate analysis. The NAVCEN information is available at:
  4. Contact Information: GPS disruptions or anomalies should be immediately reported to the NAVCEN at or via phone at 703-313-5900, 24 hours a day. The NATO Shipping Center has requested that instances of GPS interference also be reported to them using the format on their Cyber Interference link:
  5. Cancellation: This message will automatically expire on May 2, 2019.

U.S. Maritime Advisory Library:

2018-014-GPS Interference-Eastern Mediterranean and Red Seas

2018-013-North Korea Sanctions Evasion-Global

2018-012-Naval Activity-Persian Gulf, Strait of Hormuz and Gulf of Oman

2018-011-Piracy/Armed Robbery/Kidnapping for Ransom-Gulf of Guinea

2018-010-Piracy/Armed Robbery/Terrorism-Sulu and Celebes Seas

2018-009-Violence Due to Regional Conflict and Piracy-Red Sea, Gulf of Aden, Arabian Sea, Gulf of Oman, and Indian Ocean

2018-008-Measles Outbreak-Global

2018-007-GPS Interference-Eastern Mediterranean Sea

2018-006-Cyber Exploitation-Worldwide

2018-005-North Korea Sanctions Evasion-Global

2018-004-Piracy/Armed Robbery/Kidnapping for Ransom-Gulf of Guinea

2018-003-Piracy/Armed Robbery/Terrorism-Sulu and Celebes Seas

2018-002-Piracy-Red Sea, Gulf of Aden, Arabian Sea, Indian Ocean, and Gulf of Oman

2018-001-Violence Due to Regional Conflicts-Red Sea, Bab al Mandeb, and Gulf of Aden