If you've not seen this movie/documentary check it out.
IMO one of the better put together dvd's I have seen about U-boats and the time period. Interviews from U-boat commanders & crewmen, destroyer sailors and even merchantmen.
It was of interest to me because BE & AM are two of my favorite patrol grids. Sure you can tool around elsewhere in the game but being a VII fan I don't see much sence in sailing to far away with plenty of action closer.