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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.
Another 'electronic eye' was the ship's radar. The radar antenna was mounted high on the mast, about 120-150 feet above the water. Radar sends out a ping and listens for an echo, very similar to how sonar works. The primary difference with radar, is that it can see surface craft (ships and submarines which are sailing on the surface). The radar could see about 12 miles.