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Vic Fraenckel wrote-

>The open source code on my web site contains the conversion functions you
>are seeking. I completely understand your desire to "roll your own". I got
>the UTM conversion stuff from a very interesting manual "Map Projections - A
>Working Manual" which is the U.S. Geological Survey Professional Paper 1395
>written by John P. Snyder. Anyone interested in map projections needs to
>have this book. Everything you need is laid out there. Grab the source code
>from my site to use as somwhat of a reference and get the book and do your
>thing.
>
>If I  can be of any help please let me know.

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Response from George-

Vic's website is at www.windreader.com/geodesy

Thank you, Vic, for being so helpful. The Snyder volume you mention is
indeed one of the references given in Seldelmann's "Explanatory supplement
to the Astronomical Almanac".

So the open source code based on that might well give a clue, if the
equations given in Seidelmann do indeed contain any errors.

George.

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