# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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From: Stan K
Date: 2011 Nov 17, 18:51 -0500
Greg,

Yes, a picture would work - after all, it is worth a thousand words.

The Student Manual has examples and homework problems using  pictures for some and words for others.  I'm going to present it to the class as is and see what happens.

Stan

-----Original Message-----
From: Greg Rudzinski <gregrudzinski@yahoo.com>
To: NavList <NavList@fer3.com>
Sent: Thu, Nov 17, 2011 5:31 pm
Subject: [NavList] Re: A celestial navigation problem

Stan,
An actual image of the arc and micrometer drum can't be beat. Let the student figure out I.E. from exactly what is seen on the sextant. See attached.
Greg Rudzinski
P.S. Not sure on Nav Weekend 2012. SF would work.
[NavList] Re: A celestial navigation problem
From: slk1000---com
Date: 17 Nov 2011 13:51
Greg,
As far as index error/correction goes, I tried to make it as "difficult" as possible for the students. The limb reading was between 0º and -1º, so it was definitely "off the arc". The micrometer drum reading was 58.7', so the index error was -60' + 58.7' = -1.3', for an index correction of +1.3'. I'm not sure if I can increase the clarity without giving it away, e.g. making it "on the arc". Any ideas?
It was a lower limb observation, as stated in the third paragraph of the problem.
I teach a diagram similar to yours, different only in the fact that I show only the half of the circle above the horizon. In fact, in my solution i say "Use a half diagram or similar tool to do this."
BTW, are you going to make it to the Nav Weekend this year, or are you going to visit us electronically again?
Stan

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