A Sonar User is someone who operates sonar equipment, which is a type of technology used to detect objects underwater. Sonar stands for Sound Navigation and Ranging, and it works by sending sound waves into the water and measuring the time it takes for them to bounce back. The data collected is then used to create a map of the area and identify any objects in the water. A Sonar User is responsible for operating the sonar equipment and interpreting the data it collects.