GWX3 is a must. Start your career in 1939 of course. It is the year you will have relative success - bump up your realism settings with each patrol. In time, and with experience, you will master the art of strategy, tactics, and your limitations in combat.
* dovetail the sim with history, and U-Boat technology
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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