[time-nuts] Averaging Location for Position Hold

Magnus Danielson magnus at rubidium.dyndns.org
Wed Sep 14 21:59:35 UTC 2011


On 14/09/11 17:05, Michael Perrett wrote:
> The user, mostly military or marine, would choose the datum he/she wanted to
> use. This would match up the local map with the GPS derived position. The
> difference could be quite large (hundreds of feet), especially important in
> the Z (vertical) direction!

In GPS, the Z axis is not the vertical axis... X, Y and Z is the 
receivers position in meters according to GPS/WGS84 which is then 
translated into long, lat and height.


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