New Tutorial added http://rogallo.co.uk/forum/t-106555/new-tutorial-added Posts in the discussion thread "New Tutorial added" - Article on : Differences between Pressure and GPS Altitude Thu, 09 Sep 2010 12:43:50 +0000 http://rogallo.co.uk/forum/t-106555#post-313095 New Tutorial added http://rogallo.co.uk/forum/t-106555/new-tutorial-added#post-313095 Wed, 19 Nov 2008 20:14:29 +0000 Phil Chett 4297 Using GPS to police altitude limits has some potential pitfalls for competitors and organisers. The height recorded by a GPS can be up to 10% higher than the pressure altitude shown on an altimeter. So a GPS may suggest that a pilot has infringed an airspace ceiling when actually he hasn’t.

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