On Sat, 22 Aug 2009, Morten Kjeldgaard wrote: > Right, but when making differences the error will become much less > significant. As you know, the GPS device reliably tracks your relative > movements, although the absolute position might be in error. not vertically because the actual device i own actually checks for a change in atmospheric pressure and does not calculate the height from the satellite data at short intervals so anyone using a Garmin etrex vista cx or similar device cannot provide height data which accurately tells you even if you are going up or down a hill at cycling speed - i've watched it when touring and you can either go up when you are going down or make huge jumps suddenly.
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