NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Error ellipse proportions
From: Tom Sult
Date: 2017 Jun 11, 17:01 -0400
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)
