Welcome to Subsim, FabulousWin
I hope you enjoy your time here.
I'm surprised no one mentioned this. There is an add on module for Silent Hunter 3 called GWX 3.0 There is another called Living Silent Hunter. I think the add on Modules are larger than the original Silent Hunter 3 program.
Either of these add-ons will add new life to your gaming experience. People here in Subsim have said Silent Hunter 3 is like a new Simulation / game. I would agree. Both programs can be downloaded here in Subsim.
Further, There is Silent hunter 4. There is also an add-on module for SH4 called Fotrs or Fall of thee rising sun.
All of these add-ons are the result of the hard work of a number of our Subsim members that are coders and their combined efforts have contributed much. Their collective works have created immersive game play.
Look through the Silent Hunter 3 files for the add-ons. Look through Silent Hunter 4 for FOTRS. We can help you install the game programs. Let us know if you need assistance with your installs or have questions. You might also want to look at Silent Hunter 5. As Platapus said, there are many files here that might interest you. Perhaps Destroyer Command might interest you as well. I think you will enjoy your time with all of that.
Have fun and don't get sunk.
We hope you enjoy your time here in Subsim.