Since the Mavic flies, dual forward and downward vision sensors measure the distance between alone and obstructions by using shots from all 4 cameras and using the information to produce a 3D map that tells it accurately where hurdles are. Everything is determined by the type of drone you purchase. https://pacific-princess-love-boa28200.mdkblog.com/33836738/the-smart-trick-of-power-generator-bag-that-no-one-is-discussing