I am by no means an expert in this ..... I am one who has been drooling for one yet can't quite justify it as our place is too close to KLA airport. But that hasn't stopped my investigation of models, pricing, new rules, etc (in anticipation)
If not mistaken, units such as the Phantom 3 (one of the better) actually has an internal sensor for height off the surface. So in your scenario HellRaZoR, it would follow the terrain down the mountain at 400' above.
Someone who actually has a Phantom 3 can correct me if wrong.
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A bad day on the Big Lake (although I've never had one) - Still beats a day at the office!!
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