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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.
A sensory system in certain animals, such as bats and dolphins, in which the animals send out high-pitched sounds and use their echoes to determine the position of objects. See Note at bat. 2. The use of reflected sound waves, as by radar or sonar, to determine the location and size of distant or underwater objects.