I believe there are two places where Tesla&#x27;s system uses GPS.<p>One is to slow down for curves in the road. I&#x27;m not entirely sure why they don&#x27;t just sense the curves with the camera, but there are reports of spurious slowing due to out of date maps, and I&#x27;ve seen it myself when the system thinks I&#x27;m taking an exit ramp that crosses over the highway and I&#x27;m actually driving under it. Not really a problem if this gets faked out.<p>The other some sort of input to the lane keeping system, perhaps to resolve ambiguity if the camera isn&#x27;t quite sure where the lanes goes up ahead. The other sensors are by far more important in the calculation, so I don&#x27;t think this would do much either.<p>Currently, there&#x27;s no connection between the route in the navigation system and the autopilot system (e.g. it won&#x27;t take exits for you if you&#x27;re going that way) so you can&#x27;t spoof it to make it go somewhere else. Pretty much the best you could do is confuse the driver with bad directions.