If the reader does not have the map used for the overlay, this provides the information necessary to obtain it. The sheet name, sheet number, map series number, and scale must be included. Therefore, the exact time the information was obtained aids the receivers in determining its reliability and usefulness. An overlay received in time is very valuable to the planning staff and may affect the entire situation an overlay that has been delayed for any reason may be of little use. Any overlay should contain the latest possible information. For example, "Road Reconnaissance" is not as specific as "Route 146 Road Reconnaissance." This tells the reader why the overlay was made and may also give the actual location. This information includes the following data: When all required detail has been plotted or traced on the overlay, print information as close to the lower right-hand corner as detail permits ( Figure 7-2). (3) If difficulty in seeing through the overlay material is encountered while plotting or tracing detail, lift the overlay from time to time to check orientation of information being added in reference to the base.Ĭ. (2) If you have observed any topographic or cultural features that are not shown on the map, such as a new road or a destroyed bridge, plot their positions as accurately as possible on the overlay and mark with the standard topographic symbol. Since the overlay is to be used as a supplement to orders or reports and the recipient will have an identical map, show only that detail with which the report is directly concerned. Depending on the conditions under which the overlay is made, it may be advisable to plot the positions first on the map, then trace them onto the overlay. Nonstandard symbols invented by the author must be identified in a legend on the overlay. (1) Use standard topographic or military symbols where possible. Use pencils or markers in standard colors that make a lasting mark without cutting the overlay to plot any detail ( FM 101-5-1). It is imperative that absolute accuracy be maintained in plotting the register marks, as the smallest mistake will throw off the overlay.ī. These register marks show the receiver of your overlay exactly where it fits on his map without them, the overlay is difficult to orient. Trace the grid intersections nearest the two opposite corners of the overlay using a straightedge and label each with the proper grid coordinates. Then, if possible, attach it to the edges of the map with tape. Orient the overlay over the place on the map to be annotated. There are three steps in the making of a map overlay-orienting the overlay material, plotting and symbolizing the detail, and adding the required marginal information ( Figure 7-1).Ī. They are also used as annexes to reports made in the field because they can clarify matters that are difficult to explain clearly in writing. They show detail that will aid in understanding the orders, displays of communication networks, and so forth. Overlays are used to display military operations with enemy and friendly troop dispositions, and as supplements to orders sent to the field. When the overlay is placed over the graphic, the details plotted on the overlay are shown in their true position. Information is plotted on the overlay at the same scale as on the map, aerial photograph, or other graphic being used. It is often used as a supplement to orders given in the field. It is used to display supplemental map and tactical information related to military operations. CHAPTER 7 OVERLAYS An overlay is a clear sheet of plastic or semi-transparent paper.
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