A.Relative
B.TRUE
C.Compass
D.Magnetic
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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
A.making a structural change to the vessel
B.a short circuit near the compass
C.belt buckles
D.All of the above
最新試題
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?（）.
The number of pulses of energy transmitted per second is call the（）.
AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.
Deviation in a compass is caused by the（）.
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
What will NOT induce errors into a doppler sonar log?（）
Compass deviation is caused by（）.
A Doppler speed log indicates speed over ground（）.
Deviation is the angle between the（）.
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.