It gets worse
A mate of mine actually found one of NZ Plod's "tracking devices" lying on the side of the road - from what we could tell it looked like it had been fastened under a vehicle with electrical tape (and of course, promptly fallen off). The power source was a stack of D cells (not even the good ones) with wire jumpers soldered on and more electrical tape tape to hold them together. The entire package was about the size of a couple of 500gm packs of butter.
I don't think he ever found out who actually owned it - I suggested he just start to use the SIM card and see who complained.
Anyway, how well is GPS going to work in or under the body of a car?