Answer: asdic

AnswerCrossword Clue
ASDIC

Sonar

ASDIC

Early sonar, to Brits

ASDIC

Sonar, to Brits

ASDIC
British submarine detection device.
ASDIC
British sonar.
ASDICSonar, British style.
ASDICAntisubmarine device.
ASDICSonar.
ASDICBritish sub-detection apparatus
ASDICSonar, in England
ASDICSonar in Soho
ASDICSonar device