sonar is used to find the location of an object by sound waves
surface_search_radar is naval_radar. underwater_mine_detection_device is sonar_device. siren is acoustic_device. find_underwater is coral_reef. sonar is measuring_instrument. air_search_radar is naval_radar. sonar_device is reconnaissance_device. sonar_device is distance_measuring_device. sonar is navigational_instrument. passive_sonar is sonar_device.