The AN/SQS-504 Diver was an early naval medium-frequency active variable depth sonar (VDS) developed in Canada. The AN/SQS-504 emerged from a post-Second World War program to improve the detection of submarines between the thermal layers in the Gulf of Saint Lawrence. A transducer derived from a wartime British Type 144 sonar was placed in a towed body and deployed from the stern by the AN/SQA-501 handling gear. The AN/SQS-504 was succeeded by the , which used a then-modern transducer and receiver.
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