A.persistence
B.pulse repetition rate
C.pulse length
D.resolution
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A.Relative
B.TRUE
C.Compass
D.Magnetic
A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
A.deviation minus variation
B.variation plus compass course
C.combined variation and deviation
D.difference between true and magnetic heading
A.vessel's geographic position
B.vessel's heading
C.earth's magnetic field
D.influence of the magnetic materials of the vessel
A.true meridian and the axis of the compass card
B.true meridian and the magnetic meridian
C.magnetic meridian and the axis of the compass card
D.axis of the compass card and the degaussing meridian
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A Doppler speed log indicates speed over ground（）.
（）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（）.
An ECDIS is required to display which information?（）
The minimum range at which a target can be detected is basically determined by which of the following?（）.
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
A deadhead is a(n)（）.
How is variation indicated on a small-scale nautical chart?（）.
A radar range to a small，charted object such as a light will provide a line of position in which form?（）.
Deviation is the angle between the（）.