The u-boat commanders job was to command the u-boat and have an overview of what was happening around him - he was the situational awareness guy.
All of the calculations were done by the First Officer and he was responsible for accurate firing of the torpedo. As Brag has said, a Captain would have done the calculations when he was a First Officer himself.
Not doing the calculations yourself is historically accurate (but far less challenging), just keep your fingers crossed that Barnard isn't your WO!
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