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Timothy P. Mulligan's Neither Sharks Nor Wolves is an academic study of U-Boat crews of WWII, published by Naval Institute Press in 1999. He describes the rank structure of the officers as:
The 1st Watch Officer was the second-in-command. Where Mulligan gives two possible ranks, the higher rank would be for more experienced officers, with a slight bias towards them commanding larger boats.
In addition, there could be a commanding officer in training, presumably an officer who hadn't served in submarines before who was converting to the work, or a medical officer. There would also be one or two apprentice officers, FΓ€hnrich zur See, but Mulligan groups them with the seaman senior NCOs.
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1st watch officer. But He might be the cook. On a U boat at that time. You started with 1 skill on the boat. By the time you returned you had 2 more skills from on the job training. A first watch officer could probably fill in on any job on a U.boat. As each trip out he learned more. It could be senour sea man. I command. Of the boat. With first watch officer doing the navigation or math & reports.
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Following the link that NSNoob provided was the ranks of Captains. I did find the answer on another page of Uboat.net (a wonderful site).
The answer is Wachoffizier (1WO), or Watch Officer.