Every time I hook to assistance I get compass calibration needed. I just flew it through 4 packs calibrated at the field and it was fine. Brought it home Hooke it up to computer and it said calibration needed. This ever time I bring it in to check of format the card after flying. I never had to do this with my other nazas. It flew great returned to home good. Just don't get it. I'm running 3.02 and naza m.