Both lettered and numbered panels are placed throughout the observation area. The lettered panels serve two purposes: first, they divide the range into sectors defining a firer's area of responsibility; and second, they serve as reference points for marking targets. The numbered panels are used during exercises to locate sound targets. These panels are built so they can be raised or lowered, as needed.

The number of panels needed depends on the size of the range. For a range having a 50-point observation line and 300 meters deep, about 7 lettered panels and 14 numbered panels will be needed.

Numbered stakes are placed downrange. These stakes are not visible from the observation line since they are used only by instructors and target men in presenting target situations. The number of stakes needed depends on the depth of the range. As a guide, a range 300 meters deep has about 150 stakes. When placing numbered stakes, one technique is to divide the range into three sectors: A, B, and C. This allows for easy reference. Stakes are then numbered beginning at the maximum depth of the range and proceeding forward to the observation line. All stakes in one sector would have the sector letter following the number. For example, if the right sector is designated A, all numbers on stakes in that sector are followed by the letter A. Stakes in the center and left sectors have the letter B or C, respectively, after the number. The location of all panels and stakes must be recorded on the master trial sheets (see Figure B-6).

Figure B-6. Example master triai sheet.

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