"I always do a quick turnaround in the harbor so I can add stuff right away."
Well I call that a shakedown cruise - one must check to see if all yard modifications are working to spec. as well as test the crew's performance!!
I usually do a few emergency dives, a deck gun drill and damage control drill (I move the crew about manually). We then head back in the harbor for a night out on the town (save) and then we finalize and accept the boat refits and head out for our patrol. Upon arriving at our designated patrol area, I run a few emergency dives to kill the 24 hr. requirement and then we hunt! I try to limit patrols to 40 days.

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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html