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1972 · 77588 — Washington DC: United States Department of the Navy Maury Center for Ocean Science 1972. Presumed First Edition First printing. Spiral bound. Good. 4 240 pages. Consists of data graphically displayed. Arrival Angle. DB Loss Noise DB and Depth in meters. Rear cover & last page has tear. This is part of the Long Range Acoustic Propagation Project. There is a distribution limitation at the bottom of the front cover "This document may be further distributed by the holder only with the specific prior approval of the Director Long Range Acoustic Propagation Project ONR Code 102-OS" It is understood that this limitation no longer applies due to the passage of time and technology advances. Passive Sonar detects the source of acoustic vibrations or noise and determines the direction or bearing to the source. It is used as a hydroacoustic direction finder. Passive sonars operate in the range of sonic ultrasonic and infrasonic frequencies. They are used on submarines on surface vessels in containers lowered from helicopters and on buoys Passive sonars consist of sonic detector compensator filter amplifier and display device. Anti-submarine warfare ASW or in older form A/S is a branch of underwater warfare that uses surface warships aircraft or other submarines to find track and deter damage or destroy enemy submarines. Successful anti-submarine warfare depends on a mix of sensor and weapon technology training and experience. Sophisticated sonar equipment for first detecting then classifying locating and tracking the target submarine is a key element of ASW. To destroy submarines both torpedoes and naval mines are used launched from air surface and underwater platforms. ASW also involves protecting friendly ships. United States, Department of the Navy, Maury Center for Ocean Science unknown