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... 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 reduced, enabling ...
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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