Member Since: 03 Nov 2007
Location: Glorious Devon
Posts: 3254
Calibrate the Altimeter
Is it possible to calibrate the altimeter on in the Nav System? Or is it governed by barometric pressure?
Mine constantly reads about 30-40% higher that OS values for the same location so the error is constant.
e.g. My house is at 230 feet but the Alt says 370 - 390 and a known trig point of 460 feet reads as 630 feet..Never take life too seriously. Nobody gets out alive anyway.
D4 SDV6 SE Tech Kaikoura Stone MY15.
13th Sep 2016 1:52 pm
Dudleydisco
Member Since: 20 Jun 2014
Location: York
Posts: 853
In short - no! The altitude is based on GPS, not barometric pressure.
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Re: Calibrate the Altimeter
Bill Wright wrote:
Mine constantly reads about 30-40% higher that OS values for the same location so the error is constant...
It sounds horrendous when you give the error % against feet on an arbitrary reference, but when you think about the actual vertical distance being calculated from the fast moving satellites (which can be no closer than approx 13,000 miles) the % error is pretty damn small (circa 0.000002%). The altitude reference would be better if you could see satellites from a more helpful direction/geometry, but there is a spinning lumpy oblate spheroid in the way which we call home.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 03 Nov 2007
Location: Glorious Devon
Posts: 3254
Thanks Dudley Disco for the link and Robbie for the simple version of all that. It's all clear now. Never take life too seriously. Nobody gets out alive anyway.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
