Sonobuoy
Videos
Photos
A sonobuoy is a small expendable sonar buoy dropped from aircraft or ships for anti-submarine warfare or underwater acoustic research. Sonobuoys are typically around 13 cm (5 in) in diameter and 91 cm (3 ft) long. When floating on the water, sonobuoys have both a radio transmitter above the surface and hydrophone sensors underwater.
Sonobuoy being loaded onto a USN P-3C Orion aircraft
Hand deployment of a sonobuoy in the Arctic Ocean from the aft deck of the R/V Sikuliaq
P-3 Orion paradropping a sonobuoy
AN/SSQ-47B active pinger ranging sonar sonobuoy (frequency #4) and shipping container (octagonal form aids stacking)
Sonar
Videos
Photos
Sonar is a technique that uses sound propagation to navigate, measure distances (ranging), communicate with or detect objects on or under the surface of the water, such as other vessels.
French F70 type frigates (here, La Motte-Picquet) are fitted with VDS (variable depth sonar) type DUBV43 or DUBV43C towed sonars.
Sonar image of the Soviet Navy minesweeper T-297, formerly the Latvian Virsaitis, which was shipwrecked on 3 December 1941 in the Gulf of Finland
Bubble clouds shown under the sea. From ref.
Variable depth sonar and its winch