Using Arduplane 3.0.1 and MP 1.2.99 we first had (if memory serves right) several good testflights with accurate results (unfortunately the t-logs aren't available anymore).
Then during the first long flight in an area 600km north of the original place, something occured that i've never seen during the last 100+ flights with various earlier firmwares of arduplane.
The flighpath was always 30-40m right (starboard) of the planned flightline. The plane was flying up and down the same line between the planned flighpaths left and right of it.
We did not changed any params between the two flights.
Does somebody have an idea why this could happen and if/how to solve the problem?
You can find the logfile here: http://upload.droneshare.com/view/oxfvji