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During a road trip from the south of Germany to the French Riviera I noticed, that the navigation system loses track of the car's position in long tunnels (e.g. the 15 km Gotthard Tunnel in Switzerland; also a shorter one near Lucern). Due to the lack of a GPS signal the navigation thinks the car has drifted out of the tunnel and attempts to reroute using nearby local (mountain) roads.

Is this a Tesla navigation issue or is this also common in other systems/cars? You'd think the software could at least assume you must remain in a tunnel when there's only one exit at the end.

I have yet to try autopilot on my Model X as the speed limits in the map data are simply wrong too often, but do wonder if autopilot would try to drive through the tunnel wall to follow the navigation instructions. :)

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