A.variation
B.compass error
C.deviation
D.earth's magnetic force
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A.Similize
B.Clock
C.Synchronize
D.Position
A.east two degrees
B.two degrees east
C.two east degrees
D.two-degrees east
A.reflect
B.shown
C.detected
D.defected
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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（）20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions are possible.
A Doppler speed log indicates speed over ground（）.
Compass error is equal to the（）.
A radar display in which North is always at the top of the screen is a(n)（）.
An electronic depth finder operates on the principle that（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
An ECDIS is required to display which information?（）
A Doppler log in the bottom return mode indicates the（）.
An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes?（）.
A deadhead is a(n)（）.