Part G. Line Route Map

Figure 2-9.

Restorer installed in a cable line.

PART G - LINE ROUTE MAP

50. An overlay is a clear sheet of plastic or semitransparent paper. It

is used to display a supplemental map and tactical information related to

military operations. It is often used as a supplement to orders given in

the field. Information is plotted on the overlay at the same scale as on

the map, aerial photograph, or other graphic being used. When the overlay

is placed over the graphic, the details plotted on the overlay are shown in

their true position.

51. Purpose. Overlays are used to display military operations with enemy

and friendly troop dispositions, and as supplements to orders sent to the

field. They show detail that will aid in understanding the orders, displays

of communication networks, and so forth. They are also used as annexes to

reports made in the field because they clarify matters that are difficult to

explain clearly in writing.

52. Orienting.

Place the overlay over the place on the map to be

annotated. Then, if possible, attach it to the edges of the map with tape.

Trace the grid intersections nearest the two opposite corners of the overlay

using a straightedge and label each with the proper grid coordinates. These

register marks show the receiver of your overlay exactly where it fits on

his map; without them, the overlay is difficult to orient. It is imperative

that absolute accuracy be maintained in plotting the register marks, as the

smallest mistake will throw off the overlay. See Figure 2-10.

SS0444

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