Garrett,

Not a bad idea. I think a 2 inch/ 50 mm ruler is useful for this as well. See my suggestion on ruler marks on the saw. Military maps in any scale are trivial with a millimeter ruler - a simple multiplication and you have the distance or UTM grid coords. You can even read some scales directly with a mm ruler. The 7 1/2 or 15 MOA standard USGS maps are a bit more of a PITA to convert, but again, it's just multiplication by a constant. Worst case, just transfer the measurement to the scale printed on the bottom margin of all topo maps - no math involved...

Tom