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ship speed log / digital / electromagnetic
ship speed log
Walker 7070 MK2

Walker 7070 Log Only is a Speed Log System providing electromagnetic log data from a single processor. This compact, cost effective system takes advantage of "state ...

ship speed log / digital
ship speed log
JLN-720

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 ...

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JRC Europe
ship speed log / digital / dual-axis
ship speed log
JLN-205MK2

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 ...

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JRC Europe
ship speed log / digital / dual-axis
ship speed log
SAL T2

... relative speed through the water as well as two-axis true speed over the ground. In combination with an external rate of turn gyro full docking log functionality is achieved. Benefits: - ...

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Consilium Marine & Safety
ship speed log / digital / dual-axis
ship speed log
SAL T3

... combines the speed log features with echo sounding, measuring longitudinal relative speed through water as well as two-axis true speed over ground. Benefits: - Combined ...

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Consilium Marine & Safety

How to choose this product

ship-speed-log

A ships speed log is an electronic instrument which measures a vessel's surface velocity.

Applications

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.

Technologies

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.