a) The features of radar observation.
b) The advantage of visual lookout.
The correct uses of various tools or technologies.
参考答案3
ean clear丨y observe the traffic near our
shi^esp^ig^in wamingof risk of collision.
ij i[i nl i ibut ^e^mportant^sags. It should be used in all conditions. By sight, we can identify the light, sha^ft^6^�f vessels. Keep lookout by sight cannot be mgtead.
maintain a proper lookout by sight, by radar, and by all
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