Blackturtle posted soemthing about a weird GPS error on another message board which I check out from time to time and so I thought this might be an interesting topic for this message board.
The sale and use of jammers, even by police, is a federal crime with punishment ranging from fines to prison time. Whatever a user’s individual reasons may be, the jammers can present a serious threat, scrambling the satellite signals that vital systems—phones, airplanes, the New York Stock Exchange—depend on. When one of them is in use, those systems can go haywire.
https://gizmodo.com/jamming-gps-signals-is-illegal-dangerous-cheap-and-e-1796778955