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Is sonar helpful to detect the depth of the sea?

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Yes. By estimating the speed of sound in water (a salinity/temperature sensor can help), you can send a ping and time the echo from the bottom to find the depth. In fact, you can do a neat thing with a bottom-lock sonar. read more

Side-scan and Multibeam Sonar. Marine researchers commonly use side-scan sonar technology to search for and detect objects on the seafloor. Side-scan sonar requires three components—a towfish that sends and receives acoustic pulses, a transmission cable attached to the towfish that sends data to the ship, and the ship’s processing computer. read more

Sonar, short for Sound Navigation and Ranging, is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves. NOAA scientists primarily use sonar to develop nautical charts, locate underwater hazards to navigation, search for and map objects on the sea floor such as shipwrecks, and map the sea floor itself. read more

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