HedgeTrimmer
First Officer
United States
Offline
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More searching, still nothing on DJI's Mavic Air having or using a LUT to correct internal compass for differences in Earth's magnetic field involving locations.
Expanding search to DJI drones in general still turned up nothing. Well almost...
It turned up something that would point to another possible reason some people are getting compass calibration requests and problems people have reported with their compasses when flying in another country.
DJI droner mentioned that the compass corrections for deviations from Earth's magnetic field are obtained by GO / GO-4 App relaying current GPS position to DJI's sever which then sends back compass deviation to GO / GO-4 app which is transmitted to drone being flown.
Being some Smartdevices get their position from Cellular provider (which in cases outside of U.S.'s mandated 911 location for Cellphones may not be implemented), the cellphone would provide its last known position or possibly even position based on providers cellphone assigned IP address to DJI's server. Inaccurate or Incorrect postion - In / Wrong Compass Deviations - Out.
Factor in advice that Smartphone's be put in Airplane mode, when flying. DJI GO / GO-4 App can't get an update, and possibly provides last downloaded Compass deviation to drone.
Again, it would be really great if DJI weighed in on whether DJI's drones do in fact correct internal compasses for Deviations to Earth's Magnetic field, and how it is done. By LUT in their drones (and which models), by communication with DJI's servers, or by using calculations based on model for Worlds Magnetic field and if calculations are done in DJI's drones or GO-4???
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