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Sonar is a way of communicating, navigating, and detecting objects by using sound propagation. For the remainder of this lesson, we will focus on underwater sonar, which is used by submarines and some aquatic animals to perform the previously mentioned tasks.
Electronic sonar systems are used for submarine navigation and for detecting schools of fish. Some mammals, especially bats, use biological sonar to navigate and detect prey in dark conditions, commonly called echolocation. The equipment or physiology used in doing this. See also Doppler effect, lidar, radar.