NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Exercise #11 AM star fix
From: Jeremy C
Date: 2008 Jun 6, 16:44 EDT
From: Jeremy C
Date: 2008 Jun 6, 16:44 EDT
I have plenty of star fixes in the old navigational notebook. The
next few, following these comments, will have somewhat vague DR positions and I
will only give the GPS fix at solution time. This will give it a more
traditional flavor.
I will try to get a few more next week when I go out to sea if the weather
cooperates. That will be it until October however, since I am leaving the
ship in less then 2 weeks.
Jeremy
In a message dated 6/7/2008 6:18:42 A.M. West Pacific Standard Time,
george@huxtable.u-net.com writes:
GregR wrote-
And..... not to nit-pick what seems to be our preferred methodology for
solving these, but if we're all just going to use our favorite
navigation computer programs (and I realize that computers are the norm
for doing navigation these days, even I do that), what are we really
exercising other than our data entry skills (and maybe a chance to see
how the various celnav programs compare with each other)?
I'd like to request that at least a few of these be solved by the "old
school" method (i.e. only an almanac, sight reduction tables, plotting
sheets (and the usual navigation drawing tools), but no
computers/calculators other than maybe to check our work). I think
that's more a measure of celnav skills than just plugging a bunch of
numbers into a computer program and hitting "Calculate".
================
And I agree with him. It would be interesting to see a mix of results,
obtained by various methods.
And I would suggest another way to add interest and test us a bit harder.
Jeremy bases his problems on a real-life situation (and I REALLY appreciate
that!) but that means that he can start off with a precise GPS position and
then we check whether the celestial observations agree with it. But what
about dithering that GPS position, giving it only to the nearest degree or
two, or more (and saying so), like a very bad case of "selective
availability"? Then, it would become a more real test, in first having to
choose an appropriate AP (assumed position), just as one might have to do at
sea, from a DR position, if "all else failed".
George.
contact George Huxtable at george@huxtable.u-net.com
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
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