I don't know exactly what the mod is called, but have you already searched through the Silent Hunter III Mods Workshop thread? There's a lot of pages in that sub-forum (pun intended
) that may have what you're looking for...
http://www.subsim.com/radioroom/forumdisplay.php?f=195
If you've already searched through there I apologize, and hopefully someone will be able to direct you to a filefront.
Good luck kind sir!
