Re: Spec is missing 'declination' - body's current pointing angle above horizon

Hi Andrei,

But there, I'd propose something like "vertical speed"
> (e.g. an app showing how fast is someone going down a ski slope would
> likely to be interested in that more than the azimuth).
>
>
The problem with vertical speed is that it can't be easily calculated.

GPS devices are accurate in 2D positioning but they fail in calculating
vertical speed and positioning. In fact, many GPS devices used in aviation
contain a barometric altimeter to indicate vertical speed.
(http://wiki.motionbased.com/mb/GPS_Barometric_Altimeter)

Best regards,

Angel