In reply to timjones:
Hi Tim
I based my reply on the assumption that Carl wanted to draw a map, rather than find an acceptable already-drawn map on-line, for which OOMap is very usefuul. I occasionally use OOMap (easily confused with the OOMapper drawing software (OOM)) as one of my templates when drawing orienteering maps, though generally I use on-line OS mapping, aerial photos and LiDAR. As you say, OOMap is based on openstreetmap, which you can edit as a user, but I think in a fairly restricted way, as your edits, correct or otherwise, are transferred to every other user. I've not tried to edit openstreetmap myself, though, so I may have the wrong impression there.
OOMapper (OOM), like OCAD, is specifically designed for drawing maps. I'm not sure it's fair to say that OOMap/openstreetmap is "far more widely useful" than OOM. The two have completely different uses. It is true that openstreetmap is "far more widely used". OOM is rather specialised drawing software.
I'd certainly recommend that Carl takes a look at OOMap to see if it provides what he needs without re-drawing. Though if he's not going to redraw, he might be better off using available on-line OS mapping for hill-walking purposes.
Martin