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Scaling is going to be your issue - how big is 100m going to be on the screen?
I think I'd draw a rectangle in Word, and adjust the properties do that it's the appropriate size. Make it transparent (i.e. "no fill"), copy and paste, and group. That way it'll be easy to re-size it for maps of different scales. You could also have lines of different thicknesses and colours, and dashed or dotted lines if you do it that way.
Alternatively, you could use something like Google image search to find a grid, and then use the Office transparency tools (or a graphics application) to make the squares transparent.
In word 2003, ensure your drawing toolbar is available.
Click 'Draw' and select 'Grid'
adjust your parameters as necessary
Ensure 'Snap to' options are not selected.
Ensure 'Display Gridlines on Screen' is selected
Your grid should now appear. If your map hides the grid, ensure you change layout in 'Format Picture' options of the map to 'Behind Text'
Hope that helps.
If you use Google Earth instead, you can then use the freeware tool GE-Pathwhich draws grids - given two (southing/northing) points - and lots of other stuff
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