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I have two ways of getting the magnetic fields (strength, x, y, and z) using the iOS device's magnetometer. 1) Core Location Used the CLHeading from CLLocationManagerDelegate method locationManager:didUpdateHeading: . This is similar to Apple's Teslameter sample app. 2) Core Motion Used CMMagneticField from CMMotionManager 's magnetometerData.magneticField . Questions: a) What is the difference between the two? I am getting different values from both. I was expecting that they will return the same values. The difference is most notable when I start the app from a resting position (face up in a table), and then lift the device up in to the air. b) If there is a difference, when should I use the magnetic field from Core Location heading, and when should I use the magnetic field from Core Motion? Note: I also am not sure if the "magnetic field" of Core Location and Core Motion refer to different magnetic field concepts. Note: I computed strength as the square root of (x^2 + y^2 + z^2) for both approaches.

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