A kilometer is .62137 miles and the max range your ears can hear a ship in SH3 is 34 kilometers which means you must be within 21.12 miles of a ship to have any chance of hearing it. So obviously, since it's a very big ocean, most hydrophone checks will not be successful. I get tired of constantly diving only to come up empty but on the rare occasion that you do find something on your own that way, it's very satisfying. And to answer your question, headphones do help you hear the far away sounds much better than just using external speakers. I was turned on to using headphones by another member of this forum and it has really helped me. It also helps when you're under depth charge attack because you can hear the escorts propeller sounds better during their attacks on you. Keep doing the tedious grunt work, just like the real uboat captains did and you will be rewarded.
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