Three knots is pretty slow. I would think that it is realistic for the faster a ship goes, the further away you could hear it. Part of 'running silent' is slowing the sub down so the props don't cavitate and whatnot, so I would think the same applies to surface ships. Going at a slow speed would also lessen the noise of the waves hitting the ships prow as well.
Now the question is, is it realistic for a merchant vessel to be traveling that slowly in sub infested waters? :hmm:
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Guess I should change my sig since SH5 has an offline mode now 
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