You could have an LI Oberleutnant who was commanded by a Leutnant zur See, because an Oberleutnant of Engineering is regarded as being of lesser rank than a Leutnant zur See. You could also have an Oberleutnant zur See under the command of a Leutnant if the Oberleutnant was in training to be a U-boat commander. It happened quite a bit.
As for the NCO with two qualifications, this is the Obersteuermann, and he has the responsibility to oversee the third sea watch and to oversee the navigation. The navigation qualification is purely to show that he is the Obersteuermann. His navigation qualification doesn't work.
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"More mysterious. Yeah.
I'll just try to think, 'Where the hell's the whiskey?'"
- Bob Harris, Lost in Translation.
"Anyrooad up, ah'll si thi"
- Missen.
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