GPS spoofing in Shanghai had been discussed informally among maritime interests for months before a formal report was filed with the U.S. Coast Guard earlier this year. The non-profit C4ADS became interested and found that spoofing had been going on for some time. Also that, over time, many of the false vessel positions tended to form a circle some distance inland.
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I’m surprised some fishing vessels haven’t tried doing this. Especially, in closed areas or on boundary lines. Maybe they have? Obviously it wouldn’t work if you had on scene oversight.