Yesterday I flew my Phantom 3 Advanced from a 200 foot bluff to do an aerial video survey of bluff erosion for a homeowner. I ended up not flying below the 0 foot elevation (top of the bluff) on my Go app because I never have flown below 0 feet before and didn't want to risk losing the UAV for some unexplained reason (Like mortal fear!). I would really appreciate any advice about this kind of flying. I fly around houses for real estate videos and have no issues so far, but looking down into those waves below me had me a bit spooked for the safety of my bird. BTW, I just stayed at that elevation, and out about 30-100 feet and panned up and down the bluff and got what I was after. That little camera is really amazing! Thanks in advance!