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SDME ............................................................................................... SDME-Speed and Distance Measuring Equipment Furuno's Speed and distance Measuring Eqiupment Sonar DS-30, Speed Log DS-50 and DS-80 DS-30, Assits in berthing maneuvers of large or heavy vessels, where large interal forecs leave no room for error. A laser gyro option provides accurete measurement of ship's athwart speed at stern without installing an aft transducer. DS-50, Emloys a three-beam ultrasonic transmission system. It reduces the effect of roll/pitch, with makes it easier to compile highly accurate data, and enable the measurement of port-stbd speed as well as fore-aft speed. Keel clearance information is provided to warm of the reduced accuracy in shallow water navigation. DS-80, Untilizes the pair-beam at 1 MHz sonic frequency, which ensures accuracy in rough weather, This equipment does not reqiure a sensor protruding through the ship's hull; this greatly reduces the need for routine maintenance.