Since the past few flights I have noticed that the spark turns very slightly to one side (which one I forget).
When I fly in a straight line back and forth, I don’t not arrive on the same position again. It is not a constant turning though, or st least I don’t think so.

Is this a calibration thing or could it be something else?

You suspect correctly, calibrate your sticks.

Ah ok, i haven’t done a Stick calibration yet, only imu and compass..
Thanks for that Tipp. Will try it next

Nikp Posted at 2018-1-31 09:03
Ah ok, i haven’t done a Stick calibration yet, only imu and compass..
Thanks for that Tipp. Will try it next

Nikp, if the problem remains, please check if there is any interference around your spark and you can export the flight data and the black box data for further analysis.

Nikp Posted at 2018-1-31 09:03
Ah ok, i haven’t done a Stick calibration yet, only imu and compass..
Thanks for that Tipp. Will try it next

very rarely you do a stick calibration.
such movements are bound to happen due to various reasons including pilot movements