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