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
最新試題
Compass deviation is caused by（）.
The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.
A barometer showing falling pressure indicates the approach of a（）.
An ECDIS is required to display which information?（）
A deadhead is a(n)（）.
（）the canal transit，the radar was operating.
A radar display in which North is always at the top of the screen is a(n)（）.
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
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?（）.
Deviation is the angle between the（）.