In June of this year, reports surfaced of ships in the Black Sea experiencing problems with their satellite navigation. Their GPS receivers told them they were somewhere they weren't - something known as GPS spoofing.

Dr. Humphreys has long warned of the dangers of GPS spoofing. In 2013, he and his team performed a test of spoofing on a state-of-the-art yacht. According to Humphreys, these ships experienced the same thing, only this time it was not being done by researchers, but rather by a government entity.

Speaking to New Scientist, Dr. Humphreys said that "[GPS spoofing] affects safety-of-life operations over a large area. In congested waters with poor weather, such as the English Channel, it would likely cause great confusion, and probably collisions."

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