NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Index Correction
From: Robert Eno
Date: 2007 May 4, 13:25 -0400
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From: Robert Eno
Date: 2007 May 4, 13:25 -0400
General question to the list:
It is common practice to check for IC before and
after a round of sights. In my experience, they are seldom the same particularly
when taking sights under non-standard temperatures.
Question: what correction would you apply?
Generally what I do is a combination of fudging and black magic but it usually
entails simply taking the two ICs and averaging them to arrive at a single IC
that can be applied to the entire round of sights.
Please: I am not looking for involved statistical
computations. I am trying to determine what other navigators do in the field/at
sea.
cheers,
Robert
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