PBS-601 is world first Broadband searchlight sonar. The 80 to 90 kHz frequency or 130 to 210 kHz frequency can be selected depending on the Transducer. The most suitable output frequency can be selected in 0.1 kHz step depending on the fishing method and the target species from closer range to longer range. Selection of frequency is as easy and quick as tuning a radio. Flexible selection of frequency enables the user to stay away from interference with the sounders on the other vessels.