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

Hi Angel,

On Tue, Oct 14, 2008 at 10:39 AM, Angel Machín <angel.machin@gmail.com> wrote:
> 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)
>

That's ok, it'd be only an optional field, populated only by those
implementations that can determine it. The question is whether it is
useful enough to add it to the spec.

Andrei