2003 US Army BRADLEY GUNNERY 503p.pdf - Survival Books

FM 3-22.1map and on the ground. The BC can determine range using the following methods aloneor together:(1) Binoculars (Using Mil-Relation Formula). To use this method, he obtains thetarget's width, height, and length from the binocular's mil scale. He substitutes the milrelation and computes the range (Table 6-2). His accuracy depends on his knowing thetarget’s dimensions and measuring precisely with the binoculars.(a) To obtain frontal width, he measures the vehicle's front slope, from the vehicle'sleft front corner to its right front corner. To obtain the flank width, he measures the widthof the entire vehicle (Figure 6-9). The mil is a unit of angular measurement equal to1/6,400 of a circle. One degree equals about 18 mils.(b) At a range of 1,000 meters, one mil equals the width, height, or length of 1 meter.This relationship remains constant as the angle or range changes.(c) The BC completes and expresses range using metric measurements. He canexpress target size or range in other units of measurement (yards, feet, or inches).Whichever unit of measurement he chooses, he must use it for everything.(d) Since the relationship between target width in mils and meters (W) remainsconstant at varying distances, the BC can use them to determine range accurately(Figure 6-10, page 6-14). The mil relation holds true whether the W factor is width,height, or length. Therefore, the BC can determine range if he knows the dimensions ofthe target.(e) Target height might be the most consistent measurement, because length andwidth change as the target moves on the battlefield. Therefore, the BC uses target heightto determine the "battlecarry" (preindexed range and ammunition), which he mustidentify before offensive operations.(f) He obtains the mil and "W" measurements from the target measurement on themil scale in the binoculars. He divides the known target measurement ("W") by the milmeasurement. The resulting figure equals the range factor ("R"). He multiplies that by1,000 to determine range to target.(g) The distance between tick marks on the horizontal scale is 10 mils. Table 6-2provides a quick reference for determining various threat vehicle ranges. The tablegroups the vehicles, averages their sizes, and rounds their ranges to the nearesthundred meters. This table provides a quick reference for determining the ranges of threatvehicles. It groups the vehicles and averages their sizes. The table shows ranges roundedto the nearest hundred.6-12