I had no idea what the rank was of most of my crew until I found this. Hopefully, it will help.
Kriegsmarine Rank-Translation
Seemann-Seamen
Matrose-Ordinary Seaman
Matrosen Gefreiter-Able Seaman
Matrosen Obergefreiter-Leading Seaman
Matrosen Hauptgefreiter-Leading Seaman (4.5 years service)
Matrosen Stabsgefreiter-Senior Leading Seaman
Matrosen Stabsobergefreiter-Senior Leading Seaman
Unteroffiziere ohne Portepee-Junior NCOs
maat-Petty Officer
Ober-maat-Chief Petty Officer
Unteroffiziere mit Portepee-Senior NCOs
Bootsmann-Boatswain
Stabsbootsmann-Senior Boatswain
Oberbootsmann-Chief Boatswain
Stabsoberbootsmann-Senior Chief Boatswain
Offiziere-Commissioned Officers
Fähnrich zur See-Midshipman
Oberfähnrich zur See-Sub-Lieutenant
Leutnant zur See-Lieutenant (Junior)
Oberleutnant zur See-Lieutenant (Senior)
Kapitäleutnant Lieutenant-Commander
Korvettenkapitän-Commander
Fregattenkapitän-Captain (Junior)
Kapitän zur See-Captain (Maybe you?)
Kommodore-Commodore
Konteradmiral-Rear-Admiral
Vizeadmira-Vice-Admiral
Admiral-Admiral
Generaladmiral-no equivalent
Grossadmiral-Admiral of the Fleet (lurker? karamazovnew? Me!)
reference:
http://www.feldgrau.com/kmsranks.html