scan for 5 seconds in as many small steps as possible
across the field seen through the binoculars. Search the
entire sector in 5° steps, pausing between steps for
approximately 5 seconds to scan the field of view. At
the end of your sector, lower the glasses and rest the
eyes for a few seconds, then search back across the
sector with the naked eye.
When you sight a contact, keep it in the binoculars
field of vision, moving your eyes from it only long
enough to determine the relative bearing.
Sky lookouts scan from the horizon to the zenith,
aided only by sunglasses for protection from glare.
Binoculars should only be used when needed to
identify a contact that has been sighted with the naked
Scanning of the assigned sector should be
accomplished by moving the eyes in quick steps (about
5°) across the sector just above the horizon. Shift the
eyes upward about 10° and move them back in quick
steps, continuing this type of search from horizon to
zenith. (See figure 6.) When the zenith is reached, rest
your eyes by blinking them for a few seconds, then start
If you were to go on night watch directly from a
lighted compartment, you would be almost blind for
a few minutes. This reaction is similar to that you
experience when you walk from a lighted theater lobby
into a darkened theater. As your eyes become
accustomed to the weak light, your vision gradually
improves. After 10 minutes you can see fairly well.
After 30 minutes you reach your best night vision. This