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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.
SONAR is an acronym for Sound Navigation and Ranging. SONAR is a manmade way to calculate distances, and we need equipment to use SONAR. Echolocation is how marine mammals and bats calculate distances. It's very similar to SONAR, but the animals can do it naturally and don't need special equipment.