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117 Land Navigation<br />

the zero-zero point at the lower left corner of the grid square. Keeping the<br />

horizontal line of the scale directly on top of the east-west grid line, slide it to the<br />

right until the vertical line of the scale touches the point for which the coordinates<br />

are desired. When reading coordinates, examine the two sides of the coordinate<br />

scale to ensure that the horizontal line of the scale is aligned with the east-west<br />

grid line, and the vertical line of the scale is parallel with the north-south grid line.<br />

The scale is used when precision of more than 100 meters is required.<br />

Locate points within a grid square.<br />

Imagine dividing the grid square into 100 smaller squares. The coordinates of a<br />

point in such a grid square have six digits (numbers). Each of the grid squares in<br />

figure below is 1,000 meters wide and 1,090 meters high. One of the grid squares<br />

is divided into 100 smaller squares, each 100 meters wide and 100 meters high.<br />

Note the lines within the grid square also read "RIGHT, THEN UP." In an eightdigit<br />

grid coordinate such as 28409360, the first four numbers (2840) are the<br />

"READ RIGHT" part; whereas the last three numbers (9360) are the "THEN UP"<br />

part.<br />

117-6

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