The DS30L is a precision Doppler Sonar designed to assist berthing maneuvers of large or heavy vessels such as ferries, container vessels, VLCC and other tankers, where large inertial forces leave no room for error.

It provides accuract displays of ship's speed over a wide range from dead slow to maximum. Speeds are detected relative to the ground or water both fore-aft and athwartship. This dead slow capability is vital for precise docking of mammoth tankers to oil loading/unloading facilities, as well as safe navigation in narrow channels or straits. Operation at high speed assists economical cruising in open seas. The DS30L complies with IMO Resolution A.478 (XII) and IEC specifications.

The 10" wide view-angle color LCD presents a variety of information in alphanumerics and graphics in three display modes: Speed, Bearing and Nav Data. Operation is user-friendly by single-function touch keys and a trackball. The standard system includes a display unit, a separate control head and a transducer fixed hull unit.

The compact, high-frequency transducer measures ship's longitudinal (fore-aft) speed and transverse (arthwartship) speed, as well as water speed and direction under the hull. The transducer generates narrow beams which reduce the effects of cavitation. Emission of three beams greatly reduces the effects of ship's pitch/roll. High level of system accuracy is made possible even in shallow waters by the use of sophisticated new circuitry.

The DS30L comes standard with a state-of-the-art Laser Gyro. It provides accurate measurement of ship's transverse speed at stern without hte need to install another transducer. The laser gyro is required when using the Berthing Mode.