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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Obtain a fix when you don't have an clear AP?
From: Stan K
Date: 2015 Jan 11, 18:42 -0500
From: Stan K
Date: 2015 Jan 11, 18:42 -0500
John,
An expanded edition? When did this come out? It is apparently not the 2nd printing, as the page numbers you gave are on sextants, and I cannot . How can I tell from ads whether I am looking at the expanded edition.
FYI, I still use much of Exercises for Understanding and Confidence in my classes to get the students thinking "out of the box". And I always talk about the table showing the effects of vertical error when discussing whole horizon vs. split mirrors. Not that I am recommending one over the other...
BTW, I can't remember if I told you about the typo in the Great-Circle Courses formulas in Appendix A, where 306º should be 360º.
Stan
-----Original Message-----
From: John Karl <NoReply_JohnKarl@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Sun, Jan 11, 2015 5:56 pm
Subject: [NavList] Re: Obtain a fix when you don't have an clear AP?
From: John Karl <NoReply_JohnKarl@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Sun, Jan 11, 2015 5:56 pm
Subject: [NavList] Re: Obtain a fix when you don't have an clear AP?
I'm kind of late in addressing this topic, but I thought I should point out that my book disusses this, including giving the five equations to find the fix from the altitudes of two bodies.
Five equations may sound like a lot of computing, but it's just one more than working two St Hilaire sights, and gives a fix with no APs needed. Plus the equations are all the same equations used in St Hilaire, and thus easy to understand. And they can be solved with a simple scientific calculator, with Excel, etc...
If interested, see the expanded edtion of my book (Cel Nav in the GPS Age) on pages 101 to 104, or ask for more info.
J. Karl
