Possibly it was using WPS keyed to the ferry's WiFi and didn't consider the possibility that the ferry itself could move out of where it was registered (ie, the port)?

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monerozcash a day ago | parent [-]

I drove away from the ferry and passed lots of WiFi APs on the way, presumably it should have figured out the new location pretty quick with WPS.

	▲	kijin a day ago \| parent [-]
		Perhaps the car is programmed to ignore all external signals for a while if it detects significant disagreement for a prolonged time, as might have happened if it had access to both WPS and GPS during the ferry ride. In such cases it would be safe to assume that something is being spoofed, and fall back to INS.