A.deviation minus variation
B.variation plus compass course
C.combined variation and deviation
D.difference between true and magnetic heading
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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
A.accurate only in the Polar regions
B.accurate electronic servomechanisms
C.hand operated
D.accurate only if the vessel is underway
A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts
最新試題
The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.
The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
Deviation is the angle between the（）.
A Doppler log in the bottom return mode indicates the（）.
An ECDIS is required to display which information?（）
Error may be introduced into a magnetic compass by（）.
What will NOT induce errors into a doppler sonar log?（）
A barometer showing falling pressure indicates the approach of a（）.