Ships from around the world are mysteriously sending false reports of their locations. It could be due to a new kind of GPS spoofing device, which is making the vessels appear to circle a point near San Francisco
Source:
https://www.newscientist.com/article/2245305-gps-mystery-is-making-ships-appear-to-teleport-and-move-in-circles/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home