Precision Landing is an upgraded version of GPS RTH. It needs a GPS signal strong enough to initiate Precision Landing, so that the Mavic can be navigated back to the vicinity of the take-off point.
Then, the aircraft needs to be able to visually recognize the pattern of the ground it took off from, for example cracks or other identifiable patterns. A uniform patch of sand, however, is not suitable for Precision Landing. Finally, the Mavic needs to capture footage of the ground during take-off to record its appearance. This means that you should give the Mavic sufficient time during its ascent, instead of flying away immediately after take-off.

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