JB Magn App

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The magnetometer uses the same CLLocationManager class that the GPS/locationController does.

1. Tell your location manager to start updating the headings:

[CLController.locMgr startUpdatingHeading];

to begin receiving the relevant information.

3) Then, the method that will be called on your Controller class whenever the heading gets updated is this one:

- (void)updateHeading:(CLHeading *)newHeading 

...So do the necessary logic in there.