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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. There are two types of sonar —active and passive. SONAR stands for Sound Navigation and Ranging, a technique using sound waves for underwater navigation and detection. Learn about the history, working principle, types and benefits of SONAR with examples and diagrams. The full form of SONAR is Sound Navigation and Ranging. It is a technique that uses sound propagation (generally underwater, as in submarine navigation) to navigate, communicate or detect other vessels and detect objects below or on the surface of the water.
