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Lookout Training Handbook - Military training manual for keeping a lookout
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Surface Searching
lenses may melt, allowing moisture to cause the lenses to fog or bubble. Above all, keep them clean. You must be careful, however, not to damage the lenses. First, blow off loose dust, then breathe on the lenses (except in freezing weather), and gently clean them with lens paper. Rags, plain  paper,  handkerchiefs,  or  your  sleeve  or  shirttail should not be used, as they might scratch the lens. VISUAL   SEARCH   PROCEDURES Effective  visual  searching  does  not  come  naturally; a  lookout  must  learn  through  practice.  In  the  daytime a person's eyes must stop on an object in order to see it. Try moving your eyes across the water rapidly from object to object and note that as long as your eyes are in motion, you see almost nothing. Now allow your eyes to move in short steps from object to object and you can really see what is there. This  is  known  as  the  step-by-step  method.  (See figure  4.) A ship's lookout cannot be too well-trained, too alert, or too much on the job. Remember—the safety of  the  ship  and  the  personnel  on  board  depend  on  the lookout.  By  seeing  things  and  reporting  them  quickly Figure 4.—Scanning, using the step-by-step method. 10

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