GPS only receives, it doesn't broadcast.
I'm not saying there isn't something sending your info (like on-star), but GPS itself doesn't send out any information to show your location on the screen.
Your positions and travels might be stored on the device. They found the car from the belgian military guy Jurgen Conings, and I think they looked up the data in the gps of his car to know of his whereabout.
Ok, how do i stop it from receiving a signal.
Remove the GPS chip from the car. Unless you have on-star or a cell-enabled car, it would be pretty retarded though.
Without physical access, someone else can't track you by GPS alone.
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