personnel qualification standard (pqs) - I Marine Expeditionary ...

117 Land Navigation
• Convert a magnetic azimuth when the G-M angle is greater
than the magnetic azimuth (Figure 6-15).
Figure 6-15. Converting to a grid azimuth when the G-M angle is greater.
The G-M angle diagram should be constructed and used each time the
conversion of azimuth is required. Such procedure is important when
working with a map for the first time. It also may be convenient to
construct a G-M angle conversion table on the margin of the map.
NOTE: When converting azimuths, exercise extreme care when
adding and subtracting the G-M angle. A simple mistake of 1°
could be significant in the field.
117.7 Discuss the technique used to orient a map using a compass.
ORIENTING THE MAP
The first step for a navigator in the field is orienting the map. A map is oriented
when it is in a horizontal (flat) position with its north and south corresponding to
the north and south on the ground. Some orienting techniques follow:
Using a Compass.
When orienting a map with a compass, remember that the compass
measures magnetic azimuths. Since the magnetic arrow points to magnetic
117-28