I have tried multiple times to use .fit courses that work perfectly on an 805 that will not work on my 1030+. After a short time the navigation display stops updating. It is recording the correct position data but it is not displaying it. It also shows constant heading error on the map display despite having done the compass calibration motion multiple times. I have the latest software loaded. This is by far the worst Garmin device I have owned and I have owned many.