Re: Speed, heading and elevation graphic

> After reading this publication
> (http://web.math.hr/~rogina/cartography.pdf) I would suggest using
> something similar to this nomenclature:
> - Speed: projection of the velocity vector over the local tangent
> plane (LTP). Could be decomposed into Vnorth and Veast.
> - Heading: orientation angle of the speed vector (the same we have in
> the current version of the spec)
> - Vdown (or Vup): vertical speed, being positive downwards (or upwards).
Yes, that sounds like a good approach, and probably better matches
common use cases