So...Having made a grid template for SHC, I thought I probably ought to make one for SH1 as well.
So here is a 400 x 400 map divided up into squares of 10 x 10 tiles using rocks. The centre is marked with an iron X.
This utility is primarily for map art, so you can accurately transpose an image onto the map, but it is also handy for accurately and symetrically placing keeps etc in a multiplayer map.
Another use occured to me, that you can use it to plan out a massive city, or back to map art, you could create isometric 3D images (these would look a bit skewed on the minimap but would work in-game - MC Escher style pictures would be a neat trick!).
You can resize this using Alt and , - the centre will remain in the centre.