Armasight NAMPVS700133DB1 PVS7 GEN 3 Bravo Night vision goggles - Manual (Page 30)

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D. Operation with Compass Assembly
NOTE:
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 3.3.1, F.
2. For a clearer view of objects at a distance, adjust the objective focus by gripping the compass and
turning it clockwise.
3. To view the compass through the PVS-7, grip the compass with your index finger on top and your
thumb on the illumination button on the bottom (Figure 3-4). Press the button slightly with your
thumb until the proper brightness is reached. The image should appear as shown in Figure 3-11.
NOTE:
Increase the brightness slowly. If brightness is increased too quickly, excessive brightness may
burn a temporary image into the image intensifier. The goggles must be focused at or near
infinite for proper compass operation.
4. The compass readings should change when you move your head from side to side. Rotate or tap the
compass slightly to ensure that it is operating correctly. Hold the PVS-7 in a level position to verify
live rotation of the compass scale.
WARNING:
The compass illuminator can be seen by other night vision devices.
NOTE:
The compass reading is magnetic North, not true North. The compass reading is within 2° of
correct absolute magnetic bearing. Compass readings with a mounted PVS-7 (head mount or
helmet mount) can be up to ±15° of correct absolute magnetic bearing. This occurs most in
the East (90°) to West (270°) reading, and less in the North (0°) to South (360°) reading. If the
compass is inadvertently magnetized, this could cause an additional 15° error.
5. The tick mark closest to the center of the lighted display is the compass bearing. The tick marks are in
degrees, with longer marks every five (5) degrees and bearing labels every ten (10) degrees.
FIGURE 3-11. VIEW THROUGH INSTALLED COMPASS