Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 112)

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Figure 2-29. View through Installed Compass.
(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 goggles in a level
position to assure free rotation of the compass scale.
(5) The tick mark closest to the center of the light display is
the compass bearing. The tick marks are in degrees, with longer
tick marks every five degrees and bearing labels every 10 degrees.