To check it out, in FotRSU when on the Single Mission (or is it Quick Mission??), click on the "Change Sides" button, and you could do some German Missions - if there were only some German missions to PLAY!!! - oh wiat, there is...
721_SK_UboatMissionsPatrols_FotRSU.7z - but you must test them... endlessly...
They may not stay compatible as they are, but that is the plan for the future. Now, there is also some Quick Patrols in there, and the regular U-boats Career. That package is originally for Stock v1.5, and is available here at SubSim but I can't find them now... hmm... There is also one set-up for surface play
http://www.subsim.com/radioroom/down...?do=file&id=41, where you bring your own boat, and I've not played that... Also, coming soon to a computer near you will be the "Climb Mount Niitaka" mod from Keltos and Peabody, with some touches from a few others of us, and it will be a Japanese submarine Campaign... There are other mods by others that can take you into the Mediterranean on either side, the Atlantic on either side, and a few others that I can't remember right now... the Black Sea?... Some of those are Bonus Mods, others aren't