U-Boat names

[Agrippa]

I keep getting the same u-boat designations (i.e. U47 or U52 when switching to the VIIB). What file(s) do I need to change in order to choose my own Uboat designation?

[Cpt.Thorne]

Try downloading the new SH Commander that allows you easily (click and go) change Uboat numbers patrol grids manage crew and ingame settings. But if you want to tweak from the files I guesdd you need to head to your career files and change it from there...I myself stay out of those so I won´t mess anything up. Someone with specific knowledge will definetly stop by here to tell the exact files if you choose not to use SH commander
Prost!