I love my IXB,i patrol us coastal waters and even the caribbean with it after the USA joins the war. By setting speed at 9 knots(it only sees that speed on the calmest of calm seas) i can travel about 23,000 kilometers. I don't bother upgrading to the IXC or the IXD2 as the war progress either i wait untill the XXI becomes available WITH the snorkle radar warning in January 1945 if i live that long
