Hi Everyone,
Asdic was the name used for all Sonar equipment. In s/ms this consisted of passive hydrophones above and below the hull and the ability to transmit using a manual key. It could be used to 'talk' to other s/ms and surface ships by ultrasonic telegraphy using morse code. I have personally used it to find the entrance to Portland harbour in heavy fog. Pinging along the wall until the gap was found. It was quite useful for detecting mines, using a very short ping. It was certainly not used to advertise ones presence when attacking ships.
RR
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