fire-control grid

fire-control grid

[′fīr kən‚trōl ‚grid]
(ordnance)
A system of lines that divide a military map into squares, the distance between any two parallel lines representing 1000 yards or 1000 meters, depending on the type of map; maps using the fire-control grid are of sufficiently large scale to be useful in fire control.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.