Global Positioning System
A GPS (Global Positioning Service[additional sources needed]) was a device that determined its user's location and provided navigational directions. Many cars in the 21st century had a GPS system installed. (TV: The Sontaran Stratagem)
Cars with ATMOS installed had a built in GPS which could not be disabled. The system, at least when set to do so, specifically went against any orders the driver gave it. The Sontarans behind ATMOS were able to use this to control cars into killing their drivers. The GPS always said, "You have reached your final destination," before the death(s) of the driver (and passengers). When one such ATMOS car was being driven by the Tenth Doctor and Ross Jenkins, the car was driven into the river. The Doctor manipulated it into letting them out by telling it to drive into the river, which the GPS system, as programmed, went against. (TV: The Sontaran Stratagem)
Geoff Bluth was driving in a snowstorm when his GPS failed. He called his hotel for directions, but was abducted by an odd man in a pinstriped suit and bowler hat. (PROSE: Attack of the Snowmen)
