Phaedrus, the American TDC can do everything the German one can, plus some very neat tricks to boot! It's just a matter of adapting to the different machinery and not trying to insist that it work exactly the same way.
And it takes time because many of the things you do with the TDC are automatic. You need to take them out of automatic into manual to think about every step for awhile. It takes time.
But I can promise that learning the American TDC will make you a better U-Boat skipper, just as learning the German TDC will make you a better fleet boat skipper.
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