Manual

CAUTION:

You will get inaccurate readings, when using the compass on any head or helmet mount with

the magnet still installed. Only the magnet on the metal mount can be removed without caus-

ing damage to the equipment, see paragraph 3.3.11.

NOTE:

• The compass reading is the magnetic North, not true North.

• The compass reading is within 2° of correct absolute magnetic bearing. Compass readings

with mounted monocular (head mount or helmet mount) can be up to 15° of correct absolute

magnetic bearing. This occurs mostly in the East (90°) to West (270°) and less in the North (360°)

to South (180°) reading. If the compass is inadvertently magnetized this could cause an addi-

tional 15° error.

• The objective lens focus can be ne tuned after installation, but in order to obtain an accurate

reading, the compass must be vertical. (The compass image must be level.)

(1) Install per paragraph 3.3.11.

(2) If necessary to more clearly view your distant object, adjust the objective lens focus slightly by grip-

ping the compass and turning clockwise.

NOTE:

• Increase brightness slowly. Excessive brightness may burn a temporary image into the image

intensier. Do not increase brightness any more than is necessary to clearly read the compass

heading.

• The monocular must be focused at or near innity for proper compass operation.

(3) To view the compass through the monocular, grip the compass with index nger on top and thumb

on illumination button on bottom. Press button slowly with thumb until proper brightness is obtained.

The image should appear as shown in Figure 3-21.

(4) The compass readings should change when you move your head from side to side. Rotate or tap

compass slightly to ensure compass is operating correctly. Hold the monocular in a level position to

assure free rotation of the compass scale.

(5) The tick mark closest to the center of the lighted display is the compass bearing. The tick marks are

in degrees, with longer tick marks every ve degrees and bearing labels every 10 degrees.

Figure 3-21. View Through Installed Compass