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> assume you haven't changed position since you last powered on

Sounds like a classic case of programmers ignoring corner cases: Towing, ferries, car trains, pushing the car because it broke down...

It's when you find messages in the log like "this should never happen".

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You can pretty clearly use it to correct errors up to a point though. If you have a 5km difference from when the GPS was turned off, you've probably hit a corner case. If you have a 25m difference, and it's converging on the last location as you pick up satellites, snapping to the prior location is almost certainly correct.

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