Definitions - Cammenga PRECISION LENSATIC Instructional Booklet

I. DEFINITIONS
1. Azimuth - A horizontal angle in respect to North (360
degrees, 6400 mils). The number directly under the black
Index Line reads an azimuth on the Dial in either degrees or
mils. Example: azimuth of 90 degrees or 1600 mils (read 16)
is due East.
(FIGURE 4)
2. North - Generally, a topographical
MN
map shows three Norths in the
GN
declination diagram. (fig. 4)
a. True North - The actual position of
the North Pole of the earth's surface.
18° 18'
1° 54'
(shown in figure 4 by a ray or line
325 mils
34 mils
tipped with a star).
b. Magnetic North - An irregular and
wavering magnetic force which tends
to run generally Northward and
Southward, causing a compass to
point variously, depending on location. (Shown in figure 4 by
a ray tipped with MN And/or a single barbed spear).
c. Grid North - The North indicated by the map meridians
running longitudinally. Because of the earth's curvature,
these lines are often pulled a little away from the
true meridian in order to provide a straight line, rectangular
layout of grid lines. (shown in figure 4 by a ray tipped with
GN.)
10