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This is the newest version of RFB. Some of it's new features include a new ship damage model, which allows for a critical hit (lucky shot or one hit kill) change, the removal of the excessive and reliable "split in half" ship damage feature that exsists in stock, and changes tot he ships damage model that prevents torpedoes hitting the same area of the ship multiple times from casuing anything other than flodding in that area to become fast. This creates more uncertanty in the way a ship will sink and how fast and how many hits. Plus, the deck gun cannot be simply aimed at one spot on the ship and repeatedly fired. You must actualy damage the ship at or below the waterline in a manner that actualy causes flooding, and large merchants may required dozens of shells. Small arms fire wont damage things larger than small coastals like tugs, as was historicly correct. Additionaly, a new sub damage model has been added which allows your sub and crew to incur negative effects as the result of enemy fire as light as 20mm. This will make surface assults on armed merchants as small as fishing boats and challenging of aircraft to carry more risk than stock. Other features include clickable interiors, new uniforms, visual and sensor adjustments, a new AI, revised ship rosters and new weapon sounds for surface guns. Additionaly, repairs to systems seriously damaged (but not destroyed) which makes more sense, as some types of repairable damage was not nessecarily repairable at sea.