I watched an episode from Adventures of an Old Sea Dog on YouTube in the last year, when he was sailing across the Pacific, he had a Chinese fishing trawler
close by off to port that on AIS
showed it was miles away. The system is useful for the honest and useless when hijacked by those with dubious motives.
Who had the motive to spoof the warships being off Sebastopol? I can think of many on both sides of the Crimean dispute. What a strange world we live in.