I downloaded:
First Eagles: Great Air War 1918
Developer: Third Wire
If any of you are familiar with Third Wire, and their flight sims, this follows the same model.
Some folks call it Sim Light, by I have been having a great time.
http://www.thirdwire.com/
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
http://www.hackworth.com/