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Originally Posted by Kaleu. Jochen Mohr
whats this thingy for ?  |
Assuming you mean the attack disc (Angriffsscheibe), it is a tool primarily used to help the U-boat reach a favorable attack position and solve for target data to input into the TDC. It is very useful to those who use manual targeting.
One side is an angle solver, and the other is a circular slide rule to solve for time, distance, speed, and angles.