Does anyone know of, or have, any windows software that can calculate
distances based on the UK National Grid Reference system? (e.g.
I have one for the Maidenhead system (if anyone would like it just ask)
not for calculating distance between two NGR's.
Not a perfect solution, but go to
http://www.aber.ac.uk/cgi-bin/user/auj/locate.pl which is a utility to
convert NGR or Lat/Long into a Locator, then use your favourite Loc-Loc
program (I use the one by OH3NJC).