Ok, thanks for the info. I was finding that when I chose the 7th Flotilla, the early career missions (i.e., late 1939), had hardly any targets at all, so I was trying to "spice things up" a bit at the cost of some historical realism.
Edit: Never mind, found another thread about this (
http://www.subsim.com/radioroom/showthread.php?t=166252) .I forgot that the war hasn't started yet!