Royal Navy ASDIC developed through successive sets adapted to different ships and equipment. Detachable sets served trawlers, with different versions accommodating their electrical machinery. Later systems introduced range recording and spread through destroyers and sloops. Types 144 and 145 supported Hedgehog, with the latter intended for slower escorts. Type 147 supported Squid, tying acoustic equipment to the development of ahead-thrown anti-submarine weapons.
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How ASDIC sets developed around ships and weapons
Detachable sets, range recording, and systems matched to Hedgehog and Squid trace the development behind wartime escort ASDIC.