[OSM-newbies] Garmin eTrex 20/30 - is altimeter important for recording GPS data for mapping?

[Cartinus]

The Garmins don't have a pure barometric altimeter. They combine the
height from the GPS measurements with the barometric pressure. They are
"auto calibrated" over a period of twenty minutes.

On 01/31/2013 02:12 PM, Bill Ricker wrote:
> barometric altimeter isn't accurate enough for map making, but it's
> FUN when driving or hiking through mountains. or harbor tunnels.
> 
> all barometric altimeters must be calibrated to known altitude or
> known sealevel pressure frequently for any absolute accuracy.


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m.v.g.,
Cartinus