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Originally Posted by Snowman999
Not trying to teach the navy vets to suck eggs, but the rest might be interested to know that this plotting device is still used--intact from 1920--in CICs and submarine control rooms today. Throughout the USN it's known as a "mo-board". When I went through OCS in 1980 we had to learn celestial nav, inshore piloting/chart work, and mo board. It's used most often as a very quick aid to determine one of three things: 1) a contact's true course and speed and thus an intercept or avoidance course for own ship, 2) a contact's closest-point-of-approach to own ship (CPA), and 3) an own-ship true course needed to be steered relative to another (usiually a carrier) in order to take up a new position in the screen or to plane-guard.
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Snowman999,
Thanks for the informative post on the use of the "mo-board" -- a very interesting read.