5-37  Section 5    Basic Operation of the Radar 
 
 
 
 
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APP A 
APP B 
 
 
 
 
•  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.