How often do you guys calibrate your compass. When you are at the same location and you change the battery is it necessary to do it again and also when changing the battery is it necessary to redo the Home Lock again..
1.2 When to Recalibrate
(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.
Unless you want your Phantom to fly away, you should never take off before it has a lock on the home position.also when changing the battery is it necessary to redo the Home Lock again