5-37 Section 5 Basic Operation of the Radar
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• 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 ground 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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