Aardvark
First Officer
Flight distance : 384432 ft
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Quite possibly the biggest disturbance yesterday would be the updraft from the aircraft itself bouncing back off ground below.
If it were a bit higher up then I'd be tempted to calibrate the VPS (Visual Positioning System), the VPS works up to 10m (33ft) from the ground and should do what it says. It holds horizontal position relative to images the lower cameras capture of the ground. The ultrasonic transducers below also help to maintain and measure altitude up to 10 metres from surface below.
Having said that, there will always be some room for error, from the P4 spec;s:-
Hover Accuracy Range
Vertical:
±0.1 m (with Vision Positioning)
±0.5 m (with GPS Positioning)
Horizontal:
±0.3 m (with Vision Positioning)
±1.5 m (with GPS Positioning)
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