[KaleunMarco]

Originally Posted by 3catcircus

Hmm. If I knew how to put in "good" renown and advance the calendar a few months at a time, I'd be happy to test this out using a dummy career.

I assume that the ODS files identify dates of availability of u boats, flotilla change of home ports, and of equipment?

i have to echo what PB and Fifi have already posted.
Dark Water has very few, if any, boat upgrades. Mostly because the base Mod is OpMonsun and OpMonsun did not have any.
as the other two have suggested, play for a sim-year or two with one boat and then start a new career with a different boat in a different theatre. that is one thing that has been worked on quite extensively. you can have a career in the Atlantic, the North Sea, The Baltic, The Med, The Black Sea, even up north picking at the Russian traffic.
with Dark Water, one has to put aside the US-Pacific mentality of upgrading boats and finishing the war and take up the mentality that very few German skippers lasted the war and even fewer lived long enough to drive newer boats.
good luck in whatever you decide to do.