8/9/2019 Estimating Distance

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(3) Estimating by Using Known Dimensions. Distance can be

estimated by using known dimensions of vehicles and the

mil-relation formula (W = R x m///). By using the width of a vehicleappearing perpendicular to an observer as the lateral distance (W)

and measuring the width in mils (m///), the distance can be determined

by solving the formula for range in thousands (R), or R = W m///.This data, when compared with map data, will help an observer to

estimate distances. Dimensions of equipment can be obtained from

armored vehicle recognition cards (Graphic Training Aid (GTA)17-2-13), which can be obtained from the battalion S-2 or supply

officer. The dimensions of selected equipment are provided in table

2-5 on page 2-17.

ExampleAn observer sees an armored personnel carrier (BMP). He measures itswidth as seen from a side view as two mils.Formula

By using the formula, he determines the distance:R = W m/// where:m/// = 2 mils (measured by binoculars)W = 6.8 m (known dimension of side view)R = 3,400 m (6.8 2 = 3.4)