What is asdic?

  • (noun): A measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return; sonar is an acronym for sound navigation ranging; asdic is an acronym for anti-submarine detection investigation committee.
    Synonyms: sonar, echo sounder

Some articles on asdic:

Creeping Attack (naval Tactic)
... The problem addressed by Walker in the tactics then in use was that ASDIC, the means to search for and find a submerged submarine, searched forward, while the main weapon ... speeded up to attack, and when they lost ASDIC contact, and were able to move aside while the charges sank to their depth ... The advent of more sophisticated ASDIC systems, that held contact close in, and forward-throwing weapons, such as Hedgehog and Squid, also overcame the problems that made the creeping attack ...
Loch Class Frigate - Design
... Consequently, the ahead-looking ASDIC (sonar) set lost contact at the vital moment before the weapons were launched, allowing a skilled submarine commander ... warheads at a depth determined by the ships' ASDIC set, the Squid therefore attacked in full ASDIC contact for greater accuracy and lethality ... ASDIC Type 144 was carried for search and attack functions with Type 147B used for depth finding ...
Anti-submarine Warfare - History - Inter-war Period
... period saw the development of active sonar (ASDIC) and its integration into a complete weapons system by the British, as well as the introduction of radar ... and the US Navy fitted their destroyers with ASDIC ... and plans made to arm trawlers and to mass produce ASDIC sets ...
Sonar - History - ASDIC
... was changed to 'ASD'ics, and the quartz material to 'ASD'ivite hence the British acronym ASDIC ... The British tested their ASDIC on HMS Antrim in 1920, and started production in 1922 ... The 6th Destroyer Flotilla had ASDIC-equipped vessels in 1923 ...
Battle Of The Atlantic - Battle Returns To The Mid-Atlantic (July 1942 – February 1943) - Ahead-throwing Weapons - Hedgehog
... fired contact-fuzed bombs ahead of the firing ship while the target was still within the ASDIC beam ... water, making it hard to track the target because ASDIC lost contact, Hedgehog charges exploded on impact ... Hedgehog solved one of the most pressing problems, keeping ASDIC contact at short ranges ...