"Check compass settings in ground station.
Is it always pointing to 50 degrees, no metter how you turn your board? Try to roll/pitch board for 90 degrees and check if in this posittion when rotating board, it's stops pointing one value and is getting…"

"You are correct, board calculates it based on gyroscope data (maybee acc also). In live flight data it's very accurate, but if you rotate it for some time, you can notice, that it's changes little over time (for example place board facing nord,…"