@Ihvavenojob - Interesting - what car's that?
A lot of cars have manufacture-fitted trackers, particularly Jap an German I think. Toyota were rumbled in a court case ago years in the US where Toyota proved their cars were not accelerating by themselves and they knew where the cars were.
It makes a lot of sense. It's big-brotherish but on balance I wouldn't object to them being mandatory. Easy to check on routinely like road toll scanners do from bridges, roadsides etc.
I was surprised to see how cheap trackers are, now. A mate asked me if I could make one harder to find, the problem being that they use the same bands as phones, and are easy to locate, on a car, by thieves. My best suggestion was to hide the thing in the moulding at the top of his SUV's tailgate, only getting to operate when the brake lights (adjacent) are on. If you were going to scan a car for the transmissions, you wouldn't usually have the brake lights on. But the owner would have logged where the car was when it was moving. There are more sophisticated ways, but that would do as a cheap modification to a cheap device. Good comms if it's only behind plastic, too.
Stick another under the bonnet for something to find.