An echolocator is a device that uses sonar to detect objects and measure distances. Sonar, which stands for Sound Navigation and Ranging, is a technology that uses sound waves to detect objects and measure distances. It works by sending out sound waves and then measuring the time it takes for the sound waves to bounce back. This information is then used to determine the location of the object. Echolocation is used in many applications, such as navigation, underwater exploration, and even medical imaging.