Ship speed logs
Features ▶ Offers transverse speed at bow and stern position, as well as longitudinal speed ▶ Provides transverse speed at any position of the ship utilizing the built-in ...
The JLN-720 satellite log provides accurate ship speed and distance right with your fingertip operation. Regardless of weather conditions, the system is capable of providing accurate ...
Features The JLN-205Mk2 is a stable and highly accurate measurement tool to ensure stable speed data utilizing high frequencies ultrasonic waves. Dual color LED backlight The JRC MID incorporates many display modes ...
... SDME compliant with the IMO MSC.96 (72) standard, required on all internationally voyaging ships exceeding 300 GT. Boasting never-before-seen accuracy for speed measurement, the JLN-740 is also installed ...
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How to choose this product
A ships speed log is an electronic instrument which measures a vessel's surface velocity.
Such 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.
A 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.
How to choose
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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