So I've been thoroughly enjoying both books by Bob Cordery,
The Portable Wargame and Developing the Portable Wargame. And I've noticed that when it comes to grids, people tend to be very thorough in their markings:
I guess it makes it really clear where all the squares are. Some people mark only corners. I was thinking though, why not mark only the outside corners of every group of four squares? You can also do 9. And then I decided to use terrain elements for the dots so a drop cloth doesn't have to be just for gridded games.
So that's a 6x4 table with a rock pile every 1 foot. If you're doing a 6 inch grid, then the unit needs to be in one of the four corners of each larger grid. If you're doing a 4 inch grid, then you can also be half way between them and right in the centre as well as in the 4 corners (for a total of 9). The terrain would probably need to be rearranged/changed as the above assumes a 6 inch grid and has terrain pieces that mostly fill or outline those sizes. Though the terrain matching up with your grid doesn't really change when you're only market the outside corners of a square of squares. It's something you'll have to deal with either way.
The red dots are where you can put little pebbles or rocks or whatever:
And for the 3x3 marking:
If you were contemplating checking out gridded wargaming, you actually only need 9 little rocks or other tiny scatter terrain pieces to mark off an 8x8 grid on your existing surface.