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Autopilot failure in default 172/GPS

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I was running a gps-driven autopilot route, and returned to the computer to find the plane in a very wide sweeping arc, having veered off course from the flightplan...Any idea what would cause this?The autopilot selector still indicated GPS.Thanks,Andrew

I was running a gps-driven autopilot route, and returned to the computer to find the plane in a very wide sweeping arc, having veered off course from the flightplan...Any idea what would cause this?The autopilot selector still indicated GPS.Thanks,Andrew
Was the line in th GPS white or magenta? It sounds like it missed a waypoint.

Jay

Understand your question probably cannot be answered, given the information. What route? Did you try a different plane on the same route? Any add on scenery for the general area?I ask the latter because I was working on an airport modification and ended up with all the approach data being mangled. There wans't any work done on the approaches to cause them to be mangled, but that's how they ended up.

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