What does Core Motion error 102 mean?

Question

I use Core Motion\'s sensor fusing to get north oriented motion updates:

[motionManager startDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameX         


        

Answer 1

Also, make sure this is enabled. After I enabled this option, I did not encounter the 102 issue anymore while using xTrueNorthZVertical.

Settings > Privacy > Location Services > System Services > Compass Calibration