In the PV2+ User manual, there are two confusing calibration instructions: 1.2 When to Recalibrate Pg 38 (see 2) 1. When compass data is abnormal,the rear LED flight indicator will blink red and yellow. 2. Flying in different location to last flight. 3. Mechanical structure of the Phantom has changed, i.e. changed mounting position of the compass. 4. Severe drifting occurs in flight, i.e.Phantom does not fly in straight lines. 4.2 Failsafe Procedure Insert, pg 42 Quickly flipping the S2 switch of the Remote Controller from top to bottom 5 times or more will reset the current aircraft position as a new home point. Rear LED flight indicators will blink green rapidly when successful. Or am I confusing two procedures?