US MARAD warns maritime about GPS interference


This interference is causing lost or inaccurate GPS signals affecting bridge navigation, GPS-based timing, and communications equipment.

Satellite communications equipment may also be affected. Over the last year, areas from which multiple instances have been reported include the eastern and central Mediterranean Sea, the Persian Gulf, and multiple Chinese ports.

For this reason, exercise caution when operating underway and prior to getting underway. 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;
  • Providing photographs or screen shots of equipment failures experienced to facilitate analysis.



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