On Sat, 21 Feb 2004 20:09:30 -0600, mah wrote:

Now, to my old mind, I would have thought a reciprical course of 225 .
It is something in the spherical formula used for the great circle but
I'm too rusty to work through it.

You answered the question yourself: it was a Great Circle route. The
heading would change continuously in theory, at intervals in practice.
I wouldn't worry about it, if I were you. Trust your GPS. If you ever
do it in practice, you can always brush up on your celestial
navigation.

all the best -- Dan Ford
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