Page 54 of the P4 instruction manual states improvement to the P4 positioning uses four sonar sensors that function up to 10 meters above ground level. And goes on to claim a fairly tight accuracy of .1 m vertical accuracy and horizontal hover accuracy of .3 m
You aren't going to consistently...
Someone correct me if I'm wrong. The DJI Go app displays height from the ground using sonar up to 25 ft high. This is not relative to the take off elevation. Above 25 ft it uses GPS data.
The sonar measurement is fairly accurate. To the extent that I've flown close to roof tops of my...
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