Thanks guys, that's helpful. I'm not a beginner, have been around since CMSF 1.0, but I'm well out of practice! I found the answer on map sizes in the manual for the CMBS demo, it's a max of 8km x 8km, which isn't at all bad. I see that's double what it used to be (bravo Battlefront). I think I may have to get both because I just can't decide. I tell myself this is a small company that deserves support: and as an old friend of mine used to say "there are no pockets in a shroud". 😊