Armasight NAMPVS1401F9DA1 PVS14 FLAG MG Multi-Purpose Night Vision Monocular - Manual (Page 42)

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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 fine 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
intensifier. Do not increase brightness any more than is necessary to clearly read the compass
heading.
• The monocular must be focused at or near infinity for proper compass operation.
(3) To view the compass through the monocular, grip the compass with index finger 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 five degrees and bearing labels every 10 degrees.
Figure 3-21. View Through Installed Compass