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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.
It is SOund NAvigation and Ranging. Sound is used to navigate, and to detect objects in water. Sonography also has other applications.  There are two main types of Sonar syst â¦ ems, active and passive. In active sonar, a pulse of sound is sent out and the operator waits for echoes.