I have a newbuilded hexacopter with apm 2.6 and combi gps+compass-modul.its 100% stabile in stabilize-mode,but when i switch to loiter it starts to drift with the wind.....can anyone tell me how to get it better? I found somthing in the manual,but im not superb reading english so maby i understand it better if some of you explain ;-)
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"circling" is normally caused by compass interference which way be resolved by doing compassmot or moving the GPS+compass module further from electrical wires.
"drifting" could be caused by a bad GPS position. You could check your hdop values from the GPS by going to the mission planner's flight data screen, then to the Quick tab at the bottom, double click on one of the numbers and change it to "gpshdop". It can also be caused by bad vibration in the x-y axis.
Please do the compass mot test again. In Loiter mode, it uses GPS.
This is one of the critical reasons that I know for drift.