“In a recent documented issue, US military ships operating around Hong Kong were fed inaccurate GPS positions and were unable to localize the spoofing.”
Link?
I don’t buy it.
https://www.gpsworld.com/new-gps-circle-spoofing-moves-ship-locations-thousands-of-miles/
Also reported here on FR, just search.
Related: https://www.scientificamerican.com/article/gps-is-easy-to-hack-and-the-u-s-has-no-backup/