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I find that it helps me to make a grid of 8x8 squares around the outside of a 304x120 image when I am designing a map. I like to place cities in such a way that they are centered within the 8x8 square on the overland map.I hope this grid helps. I usually start with a base image and do a lot of the artwork by hand.
The reason I prefer my own grid, which has the squares located "outside" the 304x120 drawing area is that, as soon as you paste an image into the template, the squares "inside" the drawing area will no longer be visible.