MSL101L04 Basic Map Reading SR.pdf lesson 4.pdf

The breakdown of the us army military grid reference

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. The breakdown of the U.S. Army military grid reference system continues as each side of the 100,000-m square is divided into 10 equal parts. This division produces lines that are 10,000 m apart. The coordinates 16SGL08 would locate a point as shown in Figure 4-20. The 10,000-m grid lines appear as index (heavier) grid lines on maps at 1:100,000 and larger. Figure 4-20. The 10,000-meter grid square
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Grids 15 November 2013 TC 3-25.26 4-25 1000-meter grid square . To obtain the 1000-m grid squares, each side of the 10000-m square is divided into 10 equal parts. This division appears on large-scale maps as the actual grid lines; they are 1000 meters apart (1 km). (See Figure 4-21.) Figure 4-21. The 1000-meter grid square 100-meter identification . To locate to the nearest 100 meters, the grid coordinate scale can be used to divide the 1000-m grid squares into 10 equal parts. (See Figure 4-22.) 10-meter identification . The grid coordinate scale has divisions every 50 m on the 1:50,000- scale, and every 20 m on the 1:25,000-scale. These can be used to estimate to the nearest 10 m and give the location of one point on the earth’s surface to the nearest 10 m . For example, 16SGL01948253 is a gas tank.
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Chapter 4 4-26 TC 3-25.26 15 November 2013 Precision. The precision of a point’s location is shown by the number of digits in the coordinates; the more digits, the more precise the location. (See Figure 4-22, insert.) Figure 4-22. The 100-meter and 10-meter grid squares G RID R EFERENCE B OX A grid reference box (see Figure 4-23) appears in the marginal information of each map sheet. It contains step-by-step instructions for using the grid and the U.S. Army military grid reference system. The grid reference box is divided into two parts. The left portion identifies the grid zone designation and the 100,000-m square. If the sheet falls in more than one 100,000-m square, the grid lines that separate the squares are shown in the diagram and the letters identifying the 100,000-m squares are given. For example, on the Columbus map sheet, the vertical line labeled 00 is the grid line that separates the two 100,000-m squares, FL and GL. The left portion also shows a sample for the 1000-m square with its respective labeled grid coordinate numbers and a sample point within the 1000-m square. 4-17. The right portion of the grid reference box explains how to use the grid and is keyed on the sample 1000-meter square of the left side. The following is an example of the military grid reference: EXAMPLE: 16S locates the 6-degrees-by-8-degrees area (grid zone designation).
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Grids 15 November 2013 TC 3-25.26 4-27 Figure 4-23. Grid reference box OTHER GRID SYSTEMS 4-18. The military grid reference system is not universally used. Soldiers are prepared to interpret and use other grid systems, depending upon the area of operations or the personnel working together. 4-19. British grids. In a few areas of the world, British grids are still shown on military maps. However, the British grid systems are being phased out. Eventually all military mapping will be converted to the UTM grid.
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