NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Federico Rossi
Date: 2008 Aug 15, 23:25 +0200
I agree with Jeremy that knowing the exact nature of the index
error in practical navigation is crucial.
I’ve also tried to advance all the LOPs by 4’
(considering thus a -2’.0 index error instead of + 2’.0) and found
that, apart from getting a tighter group of LOPs, the fix (intersection of
bisectors between opposite LOPs) is almost the same, in fact bisectors tend to
eliminate systematic errors like this one and are more robust from a
statistical point of view than single LOPs.
Federico.
Da:
NavList@fer3.com [mailto:NavList@fer3.com] Per conto di Anabasis75@aol.com
Inviato: venerdì 15 agosto 2008 17.12
A: NavList@fer3.com
Oggetto: [NavList 6139] Re: Ocean Yachtmaster Exercises
Jim wrote:
" I teach my students to ignore index error, since
what we
use is the index correction. They are opposite, and that can be
confusing."
Jim,
I agree with you on this for the paperwork reductions with
given information, but when checking the sextant for alignment, you had better
know how to read the micrometer drum to know if the error is on or off, and
having read it; knowing whether the correction is to be added or subtracted. I
think I may be missing something, but you can't just drop the whole concept of
on and off the arc errors in practical navigation.
Jeremy
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