GPS Interference: Recent Marad Communication

The US Maritime Administration (MARAD) has issued a renewed Maritime Security Communication with Industry (MSCI) Advisory, 2020-016-Various-GPS Interference, regarding multiple instances of significant GPS interference which have been reported worldwide in the maritime domain.

This interference causes lost or inaccurate GPS signals affecting bridge navigation, GPS-based timing, and communications equipment. Satellite communications equipment may also be impacted. Over the last year, areas from which multiple instances have been reported include the eastern and central Mediterranean Sea, the Persian Gulf, and several Chinese ports. The US Transportation Command “Message for Industry” at provides additional GPS interference information.

Members are advised to exercise caution when operating underway and prior to getting underway. The US Coast Guard Navigation Center (NAVCEN) and NATO Shipping Center websites contain information regarding effective navigation practices for vessels experiencing GPS disruption. The information reaffirms safe navigation practices when experiencing GPS disruptions, provides useful details on reporting disruptions, and is intended to generate further discussion within the maritime community about other disruption mitigation practices and procedures.

This guidance also recommends reporting such incidents in real time; noting 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 experienced to facilitate analysis.

The NAVCEN information is available at:

Maritime GPS disruptions or anomalies should be reported immediately to the NAVCEN at or via phone at 703-313-5900, 24-hours a day. NAVCEN will further disseminate reported instances of GPS interference in this region to the NATO Shipping Center.

Your Managers recommend that Members take note of this information and be guided accordingly.
Source: The American Club

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