It depends on what sort of weather you experience. In heavy fog your crew won't be able to see much. That severely reduces your detection area on the surface.
Do you by any chance have the Black Sea campaign mod option or the Indian Ocean campaign mod option enabled (last)? That would explain the lack of traffic in the Atlantic area. But I'm not sure if you would have been able to leave port at all in that case.
Well, your hydrophone detection range is the best sensor (if you listen yourself instead of the crew). If you do that regularly, and still don't find anything then there really does look like something is amiss.
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