I found the thread I was looking for...
See Post #60 by Hitman
http://www.subsim.com/radioroom/show...=106923&page=3
Thats what a "Submarine Attack Course Finder" (back side of the "IS-WAS") looks like. The Bearing Rate Computer, I believe, is a refinded version. Both were used extensively during WWII and into the Cold War years.
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During times of universal deceit, telling the truth becomes a revolutionary act.
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