ATP-3-09-30 Observed Fires Download
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Chapter 3 3-10 ATP 3-09.30 28 September 2017 Table 3-3. Equipment dimensions Equipment Dimensions (meters) Side View Front View Tank (T-54/55) (hull) 6.0 3.3 Tank (T-62) (hull) 6.6 3.3 Tank (T-72B-1) (hull) 7.0 3.6 Tank (T-80) (hull) 7.4 3.4 Tank (T-90) (hull) 6.9 3.4 Reconnaissance vehicle (BRDM-2) 5.8 2.4 Armored personnel carrier (BTR-80) 7.6 2.9 Armored personnel carrier (BMP-1/-2) 6.7/6.7 2.9/2.4 Air Defense Weapon (ZSU-23-4) 6.5 3.0 Note. Prior to deployment, determine the dimension information on common opponent equipment, which may also include Vehicles from several different nations. Example An observer sees a T-55 tank, and measures its width (as seen from the side view) as 2 mils. Using the formula R + W ÷ ₥ the observer determines the distance as: ₥ = 2 mils W = 6.0 mils R = 6.0 ÷ 2 = 3.0 or 3000 meters Estimating From a Terrain Study 3-47. The observer should always use terrain map analysis to help estimate distance. A thorough study of the terrain in comparison with features or objects identifiable on the map can enhance the estimation of distance. The observer should make a mental terrain walk to the target. Then compares the features or objects with those found on the map along the same direction (observer-target line). The use of an observed fire (OF) fan (see below) will help the observer in this. Give particular emphasis to color contrasts along the observer- target line. For example, the distance across successive ridgelines or depressions in the distance may be identifiable to the eye by only slight changes in color. OBSERVED FIRE FAN 3-48. The OF fan, graphic training aid 6-7-3 (see figure 3-6) is a transparent protractor that helps the observer identify on the map the terrain as seen on the ground. The OF fan has 17 radial arms that are 100 mils apart and cover 1,600 mils. Arcs marked on the radial arms every 500 meters starting at 1,000 and extending to 6,000 meters represent the observer-target distance. Once the observer has determined an observer-target direction, the observer can use the OF fan to help determine an observer-target distance on the map.