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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.
Echolocation is a sensory sonar system that dolphins use for communication and for locating things in their environment. Dolphins release a focused beam of clicking sounds (sound waves) and then listen to the echo. From this they can determine the following about an object (such as a fish). 1  size. 2  shape. 3  distance. 4  speed.