[OZAPRS] Distance/bearing calculations

[Dave Horsfall]

I'm looking for algorithms to convert between UTM/D.M.S/etc, and to
calculate distance and bearing between any arbitrary pair.  If it matters,
assume WGS-84 and the Greater Sydney area.  It's for entry into a
spreadsheet (OpenOffice), so Wintendo binaries and Javascript etc are no
good.

Also, what's the "best" way to store position information?  The usual
XXXYYY grid reference is a little too coarse, as you can be 100m out, and
GPS easily beats that these days.  I'm guessing DDD.ddd for ease of
calculation?  Translating that to D.M.S is just base-60 arithmetic, but it
would be cool to convert from/to UTM, and Maidenhead...

-- Dave
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