If you like the historical and educational aspects of the the sim, the strategies, tactics, execution, and logs of actual events of a U-Boat, perhaps you will find this interesting.
Allow Google Earth to load so you can see the patrol as completed.
Then read Hardegen's logs in his own words. I chose this page but many more!
http://www.uboatarchive.net/KTB123-8.htm
U-123 - 8th War Patrol
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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