Can you explain exactly how you do the compass calibration. I've seen many do it wrong. I have had only one calibration fail. It was because I changed the way I normally do it and held the bird close to my body. I normally hold it out at arms length. I forgot I had a 1/4 " magnetic chuck in my pocket. I did it again at arms length still having the magnet in my pocket and all went well. I have seen people do the second part of calibration...spin the phantom like a wagon wheel. Not correct. Nose down and spin on vertical axis is the proper way. I also just turn my whole body.