why do you need a barometric altimeter? GPS gives you three co-ords Lat , Long, and Altitude. You need a clear view of the sky, ie mounted on top of an aeroplane or in a hand-held gps, and the error is 1.5x the horizontal, but so what if your +/-30m out your not trying to land a plane with this.
When it comes to altitudes I've seen errors between what the GPS says and the real thing of even hundreds of meters.. of curse, not always that high, but still. altitude pretty useless when is that inaccurate
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why do you need a barometric altimeter? GPS gives you three co-ords Lat , Long, and Altitude. You need a clear view of the sky, ie mounted on top of an aeroplane or in a hand-held gps, and the error is 1.5x the horizontal, but so what if your +/-30m out your not trying to land a plane with this.
As a a mountaineer I see the need.
When it comes to altitudes I've seen errors between what the GPS says and the real thing of even hundreds of meters.. of curse, not always that high, but still.
altitude pretty useless when is that inaccurate
A barometer isn't accurate either, after all pressure gets influenced by other things than just plain height.
That's rather simple: weather prediction.