Don't want to start a debate on doing one or not doing one. But since DJI and many of us Phantom users recommend doing one after every firmware update. I have chosen to re- Calibrate my Compass. Reason: "IF" As many of you have realized from doing the update, that the H and the ST16 both lost binding and therefore required to be rebound ! Therefore to me it makes sense that the Compass also lost it's calibration as everything seemed to reset. Not telling you all what to do !, But to me it is better safe than sorry, and I would hate to start seeing posts about the H flying erratically due to Compass issues after the new update or worse crashes! As I hope this update is a step, even small, to getting us all on track to more enjoyable flying my friends!!