We already know that Model S is already one of the most difficult cars to break into or steal. I am opening this thread to discuss what others think of yet more layers of security. As an example, there could be a secure key generated by the Tesla mobile app to unlock it before driving. Or a watchdog activity checker on the radio module to check that it is functioning well even if it is unable to pick up a mobile signal. The third idea would be for the car to hold its gps coordinates in secure non-volatile memory such that if it detects a significant change to gps coordinates without it being driven that distance, for it to go into a self deactivation mode unless that feature is defeated by owner. That would prevent it being hauled across without permission.