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117 Land Navigation<br />

Figure 6-3. Back azimuth.<br />

WARNING<br />

When converting azimuths into back azimuths, extreme care should be exercised<br />

when adding or subtracting the 180 degrees. A simple mathematical mistake could<br />

cause disastrous consequences.<br />

Grid Azimuths<br />

When an azimuth is plotted on a map between point A (starting point) and point B<br />

(ending point), the points are joined together by a straight line. A protractor is<br />

used to measure the angle between grid north and the drawn line, and this<br />

measured azimuth is the grid azimuth (Figure 6-4).<br />

117-20

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