Sean-bumble-bee
Core User of DJI
Flight distance : 15997 ft
United Kingdom
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Because the 500m height limit is written into the software, the 4000m refers to the absolute ceiling above sea level above which the air is too thin for the props to produce enough thrust to lift the drone.
Since you did not know that I would also ask, a) are you aware that it appears that, for drones flown in the Philippines, there is a legal height limit of 400ft, 122m, above the ground directly beneath the drone (AGL) and that you should be able to see the drone?
b) Wind strength generally increases with AGL and just incase you are thinking of or trying to fly up to 500m AGL you may put the drone up into strong winds?
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