sonar is used to find the location of an object by sound waves
sonar is measuring_instrument. sonar_device is distance_measuring_device. underwater_mine_detection_device is not sonar_device. sonar_device is not reconnaissance_device. passive_sonar is not sonar_device. passive_sonar is sonar_device. sonar is navigational_instrument. underwater_mine_detection_device is sonar_device. sonar is not navigational_instrument. sonar_device is reconnaissance_device.