MartinR. As you have a knowledge of all things associated with maps, at what stage does the benchmark change from inches- e.g. 123.94"- to feet & inches please? BUT, as that is only 10ft 3.94" & I'm sure Gillingham High Street is higher that that above msl, maybe it's 123ft & ?" I know that this is a little off topic but still relevant &, like John Walker, I find all these threads interesting.