----- Original Message ----- From: "Tony Brooks" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, March 08, 2007 12:33 PM Subject: [canals-list] Re: Boat trouble with GPS positioning
(snip) > God help anyone who flys! > > My GPS has the Leicester arm sumit going up and down by about 100ft - > could maake intersting landings :-) > I find the height to be the most inaccurate part of GPS on the ground. However, height derivation requires at least 4 satellites, preferably as far apart as possible, and all the signals will be affected to some extent by reflections from nearby objects, including the ground. I would expect a much better performance when clear of all obstacles, and a 360 x >180 degree horizon. -- Iain
