8-61 Section 8 Functions of the ECDIS (Option)
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8.15 Setting an own ship's speed
8.15.1 Switching an own ship's speed sensor
1 Click on the STW Source combo box of the own ship's information
2 Select a sensor source in the [STW] combo box. Any of the following sensor sources
can be selected.
MAN
Logx ("x" indicates the equipment number)
When [Menu] is selected, the [Sensor Selection/Status] dialog is displayed.
When [MAN] (Manual) is selected, a speed through water can be input in the [Sensor
Selection/Status] dialog.
• When using 1-axis log, heading speed component can be detected, but
transverse speed component cannot be detected. Then leeway effect
(component drifted by wind) cannot be detected.
• When using 2-axes log, its accuracy in shallow waters may be deteriorated, and
its speed in deep sea areas may be unable to be detected.
• When using a GPS, COG accuracy is less than ±3° at speed: from 1kn to 17kn,
and is less than ±1° at speed: more than 17kn.
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