Decoys, sonar, and I've always been a fan of the MAN Buchigeblase for the diesels.
If you're running GWX, you really don't want to stay on the surface. I just completed my first career in stock SH3 and spent a lot of time on the surface; I'm told it won't happen that way in GWX.
Therefore I would recommend sonar and hydrophone improvements and the decoys; the enhanced charge-rate batteries are a good idea for you until you get a schnorchel, when it becomes a bit safer to recharge your batteries.
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Winter Garden on the North Atlantic
Currently: U128 (Type IXC), U180 (Type IXD2), U198 (Type IXD2) operating in the I.O.
Previously: U48 (Type VIIB), U568 (Type VIIC) [Completed 1940-1945 career in Type VIIs, in the Atlantic]
Running: SH3 v1.4b w/ GWX 2.1
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