sensor issues / callibration

I recently wanted to take some footage of my team doing a charity event by swimming the english channel. On a very slow moving, stable boat. I got my DJI Air out and it said the compass needed calibration and it was not allowed to fly. It told me to re calibrate the compass which I followed the...

Curious if anyone has had experience flying below launch point; wondering how the Mavic 2 pro sensors react to a couple scenarios: 1. If the drone was to launch on the top of a sheer 1000 foot cliff; then navigated out over the expanse; how does that impact flight settings; ie max 400 ft ceiling...