And there was nothing called a "TDC " on a German submarine. There was a Torpedo Vorhaltrechner, a TVR, which performed similar fire control calculations. But the TVR was not just a TDC in German.The TVR lacked the US TDC's Position Keeper capability, but did have a lead angle calculator - a useful capability which the TDC lacked. There were other design differences as well. Both TDC and TVR had the capability to set torpedo run parameters while the torpedo was in the tube, although the mechanics were somewhat different. For more information search for TVR, not TDC.
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