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I work in automotive telematics-

You can always store 'last known location', the rest is math. The military has/will have this.

However this is a non-issue at the moment for auto, and with 5G/autonomous coming out, GPS might be seeing its last useful days in my part.

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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.

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