As long as it was a requirement to enter the navy, it wouldn't really be a "requirement" for the ubootwaffe - it would just be a matter of course. If you couldn't get in the navy in the first place you wouldn't end up on a uboat anyway.
I always assumed that the watches were divvied up among the men who were "sailors" proper rather than "technical" personnel whose primary training and responsibilities would have less to do with traditional seamanship and more to do with the specialized equipment they had to operate and maintain.
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