grid overlay

[Don]

Hi Folks
Is it possible to apply a grid overlay to a picture or word document?
And, if so, how would I change the scale of the grid?
Many thanks!
Don

 

[grammatim]

Do you want it to print, or just to see it on screen?

 

[Don]

both, actually.
I need to lay a grid over a diagram or picture of a lake, for ex, and use
the scale of the grid to calculate the surface area.