NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: sextant mirror adjustment
From: Jeremy C
Date: 2011 May 10, 09:42 -0400
From: Jeremy C
Date: 2011 May 10, 09:42 -0400
Welcome to the group Charles,
To add to what Greg said, the distance of the horizon depends on your
height of eye. The higher you are, the more distant the horizon needs to
be. From a sail boat or shore, it isn't much distance.
I prefer to use the sun or stars to check index error as it is easier for
me.
Jeremy
In a message dated 5/10/2011 12:59:28 A.M. Eastern Daylight Time,
gregrudzinski@yahoo.com writes:
Charles,
A distant shore of two miles or more is good enough for checking index error (height of eye of 4 ft.). Remember if your index error is on the arc subtract and if it is off the arc add. Try using a star and line the two images up. A little bit of side error is ok.
Greg Rudzinski
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