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Highly accurate speed measurement Triaxial vessel speed calculation Intuitive operation BAM compliant alert handling Description The JLN-720 satellite log provides ...
... stable and accurate speed measurement compared to an electromagnetic speed log. Better Stability With the new transducer and newly designed process algorithm, the impact of foam is ...
A ships speed log is an electronic instrument which measures a vessel's surface velocity.
ApplicationsSuch devices are indispensable aboard ships, despite the presence of a GPS, which furnishes course and speed over ground. Comparing the two speed readings makes it possible to calculate the currents encountered by the ship.
TechnologiesA Doppler-effect sensor is mounted through the hull in a location carefully chosen to limit hydrodynamic disturbance. It detects pulses and sends them to a central unit which calculates the ship's fore-and-aft velocity. Dual-axis models also can indicate lateral speed.
The data appears as a digital readout, a graphic LCD display or on a computer screen. Logs are usually capable of indicating the distance covered in nautical miles, sometimes with a daily total.
Dual-axis logs indicate the lateral speed, very useful data when maneuvering in port, navigating through a channel or in a river.
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