It does not work for the XXI in the game. It was supposed to give you, using active sonar and a built in calculator, the speed and direction of a target without ever having to break the surface water.
You can using active sonar, ping an object for distance, wait a given time, then ping again. This will give you two points of a line direction and the speed using simple math. Straight into a TDC and there you go -fire torpedo all under water.
It does not and never will work in game. It was never finished before it was shoved out the door.
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