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If so, I wonder why they didn't match the hydrophones with a pair of calibrated volt meters, going of known volume levels for near/far away merchants and warships.
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They did. That's represented by the green lamp that lights when a contact is made.
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Is this realistic, could a sound man actually estimate range just by listening to the screws? I'm assuming they're comparing amplitude and pitch against memory.
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Well more or less yes, sound intensity obviously increased in principle when the sound source is closer BUT the sound transmission in the sea water is a real headbreaker when it comes to giving exact solutions. A good proof of it is how even today submarines can still stay unlocated if properly hidden below thermal layers and such. That means that you could hear a strong contact for a distant target if the proper sound conditions happen, and inversely not even hear a close contact.
As a 688i/Sub Command/Dangerous Waters player I have readed a lot about the matter, and the only conclusion I have comed upon is that you hardly can draw any conclussions at all
, so variable and strange is the sound propagation thorugh water.