User Profile

I've also had this question and after contacting Code Level Support got the answer. Reference frame should be used to get magnetometer data. For example: self.motionManager.startDeviceMotionUpdates(using: CoreMotion.CMAttitudeReferenceFrame.xMagneticNorthZVertical, to: .main) { (deviceMotionData, error) in    guard error == nil else {          print(error!)         return     }     if let motionData = deviceMotionData {          let x = motionData.magneticField.field.x          let y = motionData.magneticField.field.y          let z = motionData.magneticField.field.z          let h = motionData.heading          print(x, y, z)          print(h )          print(motionData.magneticField.accuracy.rawValue )     } }