Meh, just means people like me will make money making firewalls and IDS's for cars.
Military had similar things for certain vehicles and whatnot. During my MOS training, they taught us that people would turn them off to hide illicit chow or shower runs. It'd take about 20-30 minutes to resync afterwards. So they taught us to unscrew the GPS and data antennas before making a chow run, and screw it back in when you're done. That resyncs in seconds, with no GPS audit data.