| SPERRY MARINE - NAVIKNOT 350 E |
The electromagnetic sensor houses a coil which, when nergized with an AC current, produces a magnetic field around the sensor in the surrounding water. The ship’s motion through the water produces an electrical field (E) perpendicular to the magnetic field (B) and the ship’s motion (V). The resulting signal is picked up by the sensor electrodes and fed to the preamplifier where it is converted into a digital format and transmitted to the NAVIKNOT electronics unit.
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| SPERRY MARINE -NAVIKNOT 450 D |
The Doppler transducer utilizes the Doppler frequency shift effect to determine the speed of a vessel through water. The transducer emits high-frequency sound pulses in the fore and aft directions through two transmitter windows. Two receiver windows in the transducer detect the return echo of the sound pulses. A time delay between pulse transmissions ensures that echoes are received from the undisturbed water outside the vessel’s boundary layer. The signals are processed to determine the ship's fore/aft speed vector.
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| SPERRY MARINE -NAVIKNOT 600 S / SE / SD |
The satellite sensor make use of GPS satellite signals to determine the vessel’s longitudinal and transverse ground speeds. Two GPS receivers integrated in an electronics unit with rate gyros, and a dual antenna unit determine the vessel’s heading, velocity, course and attitude. While the heading is referenced to the vessel’s fore-and-aft line, the velocity and course represent the vessel’s motion vector, i.e. the magnitude and direction of its motion over ground. The information received from the satellites is channelled to the processor PCB in the electronics unit which resolves the velocity data into the vessel’s longitudinal and
transverse ground speeds. The speed vectors combined with the rate of turn data are used to discern between translational and rotational movement of the vessel. These are used to determine the bow and stern transverse speeds shown in the docking displays.
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| SPERRY MARINE - NAVIKNOT III |
The NAVIKNOT III Marine Speed Log is a general purpose, multi-function microprocessor-controlled electromagnetic marine speed log system. It provides highly accurate indication of speed through the water, even at low speeds. The NAVIKNOT III Marine Speed Log complies with IMO Resolution A.478(XII) and meets IMO requirements for ARPA.
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| SPERRY MARINE -NAVIKNOT 400 |
Sperry Marine has introduced the NaviKnot 400, a type-approved system designed to serve as a speed and distance measuring device for a wide range of vessels. The system has been designed to provide maximum accuracy and reliability, reducing your cost of ownership.
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| SPERRY MARINE - SRD 500 Doppler Speed Log |
The SRD 500 Dual-Axis Doppler Marine Speed Log is the most accurate marine speed log in today’s market. The SRD 500 Doppler marine speed log provides for water tracking from 3 meters and excellent low speed precision for docking and maneuvering.
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