What is sonar?
sonar meaning SONAR is an acronym for “sound navigation and ranging.” Active sonar describes an apparatus that transmits high frequency sound waves in water and registers the vibrations reflected back from an object. Passive sonars listen without transmitting. They are usually military (although a few are scientific). Some marine animals, such as whales and dolphins, use echolocation systems similar to active sonar to locate predators and prey
Mother and juvenile bottlenose dolphins(Tursiops truncatus).Dolphins and whales can use echolocation to help navigate.
reference: Coral Reef Information System – GlossaryWhat is