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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: Peter Hakel
Date: 2015 Jan 11, 23:22 +0000
From: John Karl <NoReply_JohnKarl@fer3.com>
To: pmh099@yahoo.com
Sent: Sunday, January 11, 2015 3:56 PM
Subject: [NavList] Re: Obtain a fix when you don't have an clear AP?
From: Peter Hakel
Date: 2015 Jan 11, 23:22 +0000
The said equations from John Karl’s book are encoded in spreadsheet two_body_fix.xls:
http://www.navigation-spreadsheets.com/lops.html
Both intersections of the two circular LOP’s are calculated and displayed.
Peter Hakel
http://www.navigation-spreadsheets.com/lops.html
Both intersections of the two circular LOP’s are calculated and displayed.
Peter Hakel
From: John Karl <NoReply_JohnKarl@fer3.com>
To: pmh099@yahoo.com
Sent: Sunday, January 11, 2015 3:56 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
