You can also stop at a friendly base that isn't your home port (marked by the anchor-in-a-box symbol) for an instantaneous fill-up on fuel and ammo.
It's not very realistic (the loading literally takes 0 time), but it's a way to extend your patrol.
However, this is problematic early in the war, as there are few bases. Later on, there are tons of places to stop & top up, ever closer to Japan. It sure beats going all the way back to Pearl or southern Australia.
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Windows 10 Pro (x64)
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