Operation Manual

2-40
NOTE
• The compass reading is the magnetic North, not true North.
• The compass reading is within 2° of correct absolute mag-
netic 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 additional 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 2.3.12.
(2) If necessary to more clearly view your distant object, adjust the
objective lens focus slightly by gripping 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.
FIGURE 2.22. VIEW THROUGH INSTALLED COMPASS