This is a simple example of using the compass ANE from distriqt to get compass heading updates.

CompassExample.as

/**
 *        __       __               __ 
 *   ____/ /_ ____/ /______ _ ___  / /_
 *  / __  / / ___/ __/ ___/ / __ `/ __/
 * / /_/ / (__  ) / / /  / / /_/ / / 
 * \__,_/_/____/_/ /_/  /_/\__, /_/ 
 *                           / / 
 *                           \/ 
 * http://distriqt.com
 * -------------------------------------
 * 
 * brief: Compass ANE example for initialisation, and basic usage.
 * tag:   distriqt.extension.compass
 *
 */
 package
{
    public class CompassExample extends Sprite
    {
        public static const DEVELOPER_KEY : String = "your-dev-key";

        public function CompassExample()
        {
            Compass.init( DEVELOPER_KEY );
            if (Compass.isSupported())
            {
                Compass.service.addEventListener( CompassEvent.HEADING_UPDATED, headingHandler, false, 0, true );
                Compass.service.register();
            }
        }

        private function headingHandler( event:CompassEvent ):void
        {
            trace( event.type +":"+ event.magneticHeading+":"+ event.trueHeading+":"+ event.headingAccuracy );
        }
    }
}