NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: A basic sight reduction question
From: Stan K
Date: 2012 Apr 4, 19:10 -0400
From: Stan K
Date: 2012 Apr 4, 19:10 -0400
Gary,
You are the second person who suggested not mentioning the situation to the students, which is sounding like a pretty good idea, but the issue is not accuracy, just procedure. On the off chance that someone asks, I would like to know what is the "correct" procedure. I have a message of to the "contact us" at the UK Hydrographic Office. Let's see what they suggest.
Stan
You are the second person who suggested not mentioning the situation to the students, which is sounding like a pretty good idea, but the issue is not accuracy, just procedure. On the off chance that someone asks, I would like to know what is the "correct" procedure. I have a message of to the "contact us" at the UK Hydrographic Office. Let's see what they suggest.
Stan
-----Original Message-----
From: Gary LaPook <garylapook@pacbell.net>
To: NavList <NavList@fer3.com>
Sent: Wed, Apr 4, 2012 4:54 pm
Subject: [NavList] Re: A basic sight reduction question
From: Gary LaPook <garylapook@pacbell.net>
To: NavList <NavList@fer3.com>
Sent: Wed, Apr 4, 2012 4:54 pm
Subject: [NavList] Re: A basic sight reduction question
My Nautical Almanac has 276 pages of data and explanation and 30 pages of "increments and corrections." If you want perfect, good to the second, I&C tables then they will have to be 1800 pages long instead of the current 30 pages. All of life is an approximation and any concern you have about these corrections not being "exact" is lost in the noise of the rest of the celestial navigation process. A thorough study of thousands of sextant observations taken by professional navigators showed a standard deviation of about 1.5 minutes and if you are using H.O. 229 it states that the accuracy is usually within 0.2' with some weird cases producing errors up to 3.9' in the Hc so don't get too upset about the possible inaccuracy introduced by the I&C tables. Don't mention it too your students, they won't notice and why make it even more complicated for
them. 276 30 --- On Wed, 4/4/12, slk1000@aol.com <slk1000@aol.com> wrote:
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