by nigheandonn » Fri Aug 18, 2017 8:55 pm
Maybe I'm missing the point, but if you know you're in the Cairngorms, don't the numbers tell you which square you're in?
I mean, you can be at 999999 in one, and 001001 in another, and 999001 in a third, and 001999 in a fourth (if I haven't muddled my numbers), but you can't be at the same grid reference in another square without being 100km away.