Correct me if I'm wrong but the normal sound frequency stuff is the two "balls" below the hull and is responsible for passive listening. The complete sonar/hydrophone set includes the "T-bar" fore deck device which allows ultra-sonic (higher than human hearing frequency range) operations such as pinging.
If anything the ping shouldn't work until that "T-bar" is submerged but the passive hydrophone part should work pretty much 24/7.
I take issue with calling the high frequency sonar system "supersonic" as this means faster than sound. I believe ultrasonic is more appropriate.
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