[Captain Vlad]

I actually do the opposite of what Rockin' Robbin suggests. Daylight, I am submerged unless I'm transitting or in hot pursuit. Actually, in some cases I'm submerged AND just sitting there. Your hydrophones are very useful detection tools, and with the engines off, they give all-round coverage that cannot be detected by the enemy.

Now, that said...Quillian is quite correct. If you fish a dead pond, you won't catch anything. I tend to run in the South Pacific, and I've found that the Indochina coast is an excellent hunting ground. I've just started using the RSRD mod, so I don't know many more good places with that running, but stock, the Makassar Straight between Borneo and the Celebes is excellent, as is the area south of Rabaul.