A.reflect
B.shown
C.detected
D.defected
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A.A vessel on the starboard bow whose bearing is changing and range is decreasing
B.A vessel on the starboard bow whose bearing is steady and range is increasing
C.A vessel on the port bow whose bearing is steady and range is decreasing
D.A vessel on the port bow whose bearing is changing to the left and range decreasing
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（）the canal transit，the radar was operating.
AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.
A Doppler speed log indicates speed over ground（）.
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
An ECDIS is required to display which information?（）
Deviation is the angle between the（）.
An ECDIS is required to display which information?（）
A Doppler log in the bottom return mode indicates the（）.