In my experience, hydrophone lets me detect enemies at much greater distances than visual. Hydrophone contacts can be easily picked up at 20-25 km whereas visual contact normally only gets me 9km at best. Manually taking the hydrophone over can get you something out to perhaps 35-40 km.
No, I have no radar searching for me. I'm just in no hurry to get to my destination. I'd rather sink what I find on the way.
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