Originally Posted by
msjh
And, yes, the 400' limit set by government is 400' above ground level. Again, the DJI software enforces that limit by default
The software constrains the height AGL? How does that work in practice?
If the drone is using GNSS height, that implies it must have access to a terrain model to derive height AGL.
If it's using baro height, the same applies, with the added complication that the drone/controller needs to know the QNH.
Both sound a bit unlikely.