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For those of you with the ION cd you will find several papers
discussing various ways to compute the fix by direct computation.

Look at items 5, 34, 35, 46, 47, 59, 64, 66, 80, 83, and 246. Van
Allen,s paper is number 5.

Here is a link to the ION table of contents.

http://www.ion.org/publications/toc/celnavTOC.pdf


gl

On Oct 31, 2:51 pm, d walden  wrote:
> It is of course possible, as has been pointed out, to calculate the latitude 
and longitude of the points of intersection of two circles of position 
directly with neither an estimated nor an assumed position.  Nor in fact are 
altitudes and intercepts or any plotting needed.  The intersection of cones 
method, described by Frank in the discussion of latitude by lunars, and shown 
in a previously posted FORTRAN and Maxima example can be used.  A few minor 
changes to the programs posted are needed.
>
>   The problem is, in fact, slightly easier.  It can be done with 
intersecting planes.  The attached little spread sheet is an example of how.  
One enters with the altitude, declination, and GHA of two bodies.  Out come 
the latitudes and longitudes of the two intersection points.  If you have 
three bodies, pick a different pair, and two of the points should wind up 
quite close.  There you are.
>
>   Seems to be working for me, but no guarantees.
>
>  __________________________________________________
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>
>  vanAllenFIX#2.xls
> 22KDownload


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