A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
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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
A.accurate only in the Polar regions
B.accurate electronic servomechanisms
C.hand operated
D.accurate only if the vessel is underway
最新試題
Deviation is the angle between the（）.
Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are（）.
What will NOT induce errors into a doppler sonar log?（）
A Doppler log in the bottom return mode indicates the（）.
（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.
An ECDIS is required to display which information?（）
A Doppler speed log indicates speed over ground（）.
A radar contact will remain stationary on a relative motion radar display only when it is（）.
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（）.