DS30 Doppler Speed Log

• Complies with IMO Resolution and IEC specifications
• Provides accurate speed measurement in shallow water (1 cm/s, bottom clearance>1 m)
• Bottom-tracking speed down to 200 m depth. Auto or manual changeover between ground-and water-tracking
• Large backlit color LCD display gives versatile presentation in graphic and alphanumeric form
• 3-beam transmission reduces effects of pitch and roll for better accuracy
• Two hull unit types to choose from: gate valve or diver replaceable using watertight connector
• Displays ship's speed and course with ground tracking accuracy when interfaced with an external GPS receiver
• A variety of analogue speedometers and digital speed indicators optionally available for remote monitoring
• Analogue speed data and distance run signal fed to various onboard instruments for improving bridge automation
• Laser Gyro option for providing ship's transverse speed at stern and rate of turn indication

The DS30 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 accurate 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 DS30 complies with IMO Resolution A.478 (XII) and IEC specifications.

The 10" LCD offers a wide viewing angle for presentation of 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 speed and transverse 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.

As an option, a state-of-the-art Laser Gyro is available. It provides accurate measurement of ship's transverse speed at stern without the need to install another transducer. The laser gyro is required when using the Berthing Mode.
 

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