Mathias Fröhlich wrote:
> At first I need to know how this local frame is meant.
> What I have found from the code is that it is meant to be the *geodetic*
> horizontal local frame.
> But is is meant to be fixed at the aircraft and thus rotates due to the
> aircrafts velocity or is it fixed at the earth and relocated for every frame
> to display?

For what it's worth, YASim supports this "NED" (north/east/down)
coordinate frame for output, but doesn't use it internally.  It's
pretty strange IMHO, and of course has a singularity problem at the
poles.  If JSBSim is having trouble with it, it might be best to just
junk the concept and fix the HUD code to use body coordinates.


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