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My understanding is that a GPS is less accurate than a calibrated barometric altimeter for the followiwng reasons.....
1) The timing error is higher in the vertical direction so by default it is about 1.5x horizontal.
2) The stated elevation is relative to the WGS84 datumn which is a mathematical approximation of the Earth's ellipsoid and mean sea level as opposed to local sea level.
I am happy with this but need to convince a mate. I can't seem to find any definite links online so if anybody has any that would be appreciated.
Ta.
Posted : 07/01/2013 3:59 am
