[myself248]

Except that "store the last known location" logic breaks ferries, towing, and other movement of the car while it's off. You need an override, or some way of deciding that, yes, this new and different location is actually sane.

And in the case of a ferry, the user is expecting to have accurate location and nav instructions very quickly after key-on as they leave the port in the new place, so that mechanism needs to make its decision pretty fast.