The first image, the 5K x 5K one, is the actual 'zoomed' size. I just couldn't post that full size for the subsequent images, so I'm posting them shrunk by 30% until everything's done, then I'll mesh everything up again into one image (hopefully...). I was thinking too that I don't need to do 25 map sections; I only need to do four - each one 2500 x 2500. That shouldn't strain my PC unduly.