apologies if repeated - I skipped a few threads
There is a program called memory map which is by far the best Ordnance survey software I have seen.
http://www.memory-map.co.uk/software.htm
I have seen it working with garmin gps systems allowing plotting waypoints and track in 3d modelling using the contour maps as its matrix. It has excellent pan and source variables. It also does a neat trick with satellite photogarphy laying images over the 3d rendered map.
I am thinking of buying the ridgeway for £49
http://www.memory-map.co.uk/acatalog/uk_maps_onland_1_25000.html
(many different maps here scroll down to near the bottom for ridgeway map)
I take commision if anyone at memory map is reading
broen