Unless I'm mistaken this mod's campaign lasts until year 1944. One of the features is that real navigation should be used(?). Deck gun is balanced to more realistic levels, ie its not so powerful as in original game.
Mission objectives tonnage bar removed as they all are now date controlled. Open Horizons II, subsim forums by Trevally Max time compression is limited to x512 for stability reasons (512? hehe). This is basically a campaign mod to extend the war to year 1945. New campaign covering the 43-44 timeframe. Over 30 new ports and 2 new U-boat bases. It also includes new flotation sinking config, which at least to me is quite radical, ships take like hours to sink now (or at least thats how it feels).