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Originally Posted by PeriscopeDepth
I would think early sonar would be pretty degraded at PD due to surface noise. For best performance, I would think you'd need to be below PD. I bet the SH engine can't handle that, so it's below PD or nothing.
PD
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See
http://www.maritime.org/fleetsub/sonar/index.htm for everything you'll ever want to know about WWII sub sonar ops. Clearly it worked at PD as turn-counts were the primary speed-determining method fed to the TDC. Not to mention dozens of printed accounts, both real and fictional.
Surface noise in the sound channel is a challenge, yes, but fleet boats had dual sound heads on the keel, not topside. 55+ feet below the surface. Not hearing a maneuvering surface contact at 400 yards is impossible.