Unterwasser-Ortungsgerät der Alliierten, Abk. Allied Submarine Detection Investigation Committee Abbreviation for Allied Submarine Detection Investigation Committee: Allied Anti-Submarine Detection

The Allied Submarine Detection Investigation Committee. Organization active during the First World War seeking more sophisticated methods of locating enemy submarines.

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