Yes and no. There are three hydrophone sensors on the boat. On deck and rotating in your sight is the audible range sonar head. Of course, being on deck, it's not wet when you're on the surface and so doesn't function.
However, under the keel at the aft end of the forward torpedo room are the two supersonic sonar heads. They work at ranges outside the frequency the human ear can hear and are very useful, even on the surface.
The sonar operator's manual made it clear that these continued to operate on the surface and directed the sonar operator to continue monitoring the supersonic sonar while on the surface unless ordered by the Captain to stand down. This indicates that they expected to develop contacts from sonar while on the surface.
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