I advise you get GWX 3.0 (As will most people on this forum :P) Sub fuel is increased so you can use straight lines without using more than normal fuel. The SH3 map doesn't take into account the spherical Earth at all, so great circles are just as pointless.
As for IXs, one of them (I don't use them) has the same dive time as the VIIB, but the others have significantly longer times. The longest is the IXD2 with 42 seconds. This will get you killed in late war in GWX, though stock may be alright. But remember that you are a bigger sub in general.
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The entire German garrison of Vanviken, right here in your thread!
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