This is also a good way to eliminate wasted time on the Playing Field,
If you have advanced information about the playing field, you can map and overlay the field to eliminate areas that there will be no opposing force, Identify choke points, possible strongholds or defensive positions.
Overlay your Map, Black out all Open areas, Terrain that can´t be defended, Steep Grades, Pits, Streams/Rivers/Ponds/Lakes,
Now you see the actual size of your Playing Field, Do a Woodland Trace in Green ( Tree Lines ),
Locate the areas that can best be defended with the minimum amout of Players, Circle them in Red You have ídentified Possible Opposing Force locations.
Locate Choke Points, Box them in Red, possible Ambush or Sniper locations
all built up areas are Possible Danger areas ( Red )
This works well if you are a Mil-Sim Player, and if you are in a leadership position, reduces the amount of map to be learned, and based on your own individual experiances, eases your desicion making process.