For a more complete RN campaign download Japlance's fine work ( install it over WDAD):
http://www.subsim.com/radioroom/showthread.php?t=181770
It uses WDAD as a base layer but moves the action to the mediterrean as Lurker never contiued development of WDAD (also adds the U-class), he gave his permission for his files to be used when i asked on the author's behalf (so a kinda official continuation of Lurker's work!).
Regards
Kaleun