> calculations are done on earth-centered coordinates IIRC. BTW, if > only three satellites are visible, then the receiver will _assume_ > your current altitude (based on the most recent determination) and > use that. Hence the greater uncertainty with only three satellites. ... and the current altitude is normally zero for a kayaker, :-) same as his recent altitude, or am I missing something? *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
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