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    Re: Error ellipse proportions
    From: Tom Sult
    Date: 2017 Jun 11, 17:01 -0400
    Frank. 
    I understand and agree. I was responding to the often sighted interest of using celnav to do things it can't or should not be used for. Like lacing a reef infested water. When you start looking at the sources of error they add up quickly. A hazy horizon on a pitching boat  can have dramatic effects. 
    By the way my rule of thumb is 5 mile is in my 27 foot trimaran +/-2sd, in anything over 10 knots for wind in an open fetch. At 20 knots of wind I double it. 

    Tom Sult, MD
    Author: JUST BE WELL (goo.gl/jUbWIX)

       
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