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Old 03-23-19, 10:50 AM   #6
Pisces
Silent Hunter
 
Join Date: Dec 2004
Location: AN9771
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The smallest disk has the AOB scale. See both sides going up to 180 degrees. So if you align the observed AOB, either port or starboard, against the relative bearing (direction of periscope/UZO/TBT) then you can figure the target course. (assuming own course was set with the middle disk beforehand)
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