In the DMD Setting app, under GPS settings, do you have “Filter GPS Accuracy” enabled? Wonder if that would help.
Also, at a point when you’re having the Arrow so far off from the track you know you’re on, I’d be interested to hear what you’re getting from running the Satellite test app at that point in time. See if you’re getting a 3D fix of GNSS Status (Upper left hand corner in the app). And what average signal strength is.
