Excellent stuff, thanks gentlemen. It will take me a while to soak up all the information in the guides you guys have linked to, so I should be pretty busy for a while
I am truly amazed at the amount of depth in this game...(pun intended

)
There is so much more I have yet to learn. I've got the basic idea of what to do, but I still feel like I'm making noob mistakes...I'm playing on 0 realism, but I think it's time to start switching some of those realism settings on. For instance I find myself getting in the habit of using the ahead flank speed way too often, which with limited fuel turned on would equate to a relatively short trip I imagine...
one more question before I hit the hay...
6. Is it possible to switch to a different submarine while in dock? or does the game give you promotions to different subs as you progress through the game?
Thanks a bunch guys