U.S. Maritime Advisory 2018-014 informs of a continued GPS interference by vessels and aircraft operating in the Eastern Mediterranean Sea. This kind of interference is causing the alternation of GPS signals and in general affects the navigation and communication of vessels.
U.S. Maritime Advisory 2018-014 focuses on the continuous GPS interference that is reported by vessels and aircraft. This interference is mostly reported near Port Said, Egypt, the Suez Canal, and near Cyprus.
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https://safety4sea.com/gps-interference-reported-in-mediterranean-and-red-seas/