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> It doesn't factor terrain height, so flying around mountains is impossible.

What do you mean by that? I've been flying around the Austrian alps without any problems but when I'm at home I can't go higher than xxx meters above my town because it's within the flight path of a local airport. Which seems to be a reasonable approach?

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The software limits height by allowing 400ft of elevation above the takeoff height. So it's tricky to take off at the base of a mountain and fly up the side because you'll be restricted at 400ft from the start point, despite it actually being totally legal provided you remain less than 400ft from the mountain at the point directly below the drone.

Ah, that makes sense. Thanks for clarifying.

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