For the sonar, there would be two men manning the sonar stack in the conning tower when at battlestations. There's two handles and displays there for them to use. So, in theory at least, there could be three sonar operators on duty when at battlestations. (The conning tower sonar is the supersonic listening post, and the torpedo room sonar is the sonic post):
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Quote:
In the conning tower
The photograph below shows a WCA stack, in which five units are grouped for efficient supersonic operation. There are separate remote-control units for the starboard (QB) and port (JK/QC) projectors, each with its receiver-amplifier. During routine search only one type of supersonic gear is manned. But when a contact is reported, QB is taken over by the sonar operator whose battle station is at the stack, and a second operator mans JK/QC. Normally during an attack, QB tracks the target, while JK searches for other ships. The range indicator is not used for listening.
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As for the SD Radar, the only thing the Fleet Type Submarine Manual says is:
"Insure that the proper watch is maintained on the control room (SD) radar when ordered manned, and that any contact, however doubtful, is reported instantly to the OOD."