Originally Posted by Polwart
Although the "mobile phone" style trackers have an integral battery which is kept charged by the main boat battery. So I would expect it to last several hours (I think one of them claims >24 hrs)? after disconnect. Surely you only need to be able to track for about 2 hours after the engine leaves its designated geofence for you to have time to (1) verify its on the move/stolen (2) tell the police and give them the tracking information.
Your an engine right, Mr Spiner, and your thrown into the back of a transit van. You have been disconnected from your power supply but you have one built in, but it is being drained fast because the metal van is getting in the way. Then you get unloaded and put inside a railway arch, or other nefarious but suitably unseen location. Your battery is going flat and you can not see the sky.
OK, I have scared myself now, I shall go for a lie down.