Once upon a time Paul owned an expensive Harley Davidson Fatbob.
One night while he was thinking about security he started thinking about GPS trackers.
One thing led to another, and Paul has wokred out a system to track vehicles.

Once again, open source to the rescue!
Traccar is an open source GPS tracking software.
You have to hack at away at some Android phone to get it going, but why not, when you want to look after your sweet ride.