A.The soft iron spheres on the arms of the binnacle
B.Magnets placed in trays inside the binnacle
C.A single vertical magnet beneath the compass
D.The Flinders bar
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A.Course per magnetic steering compass
B.Gyro error
C.Variation
D.Maximum rudder angle previously used
A.Flinders bar should be inverted
B.Heeling magnet should be inverted
C.The quadrantal spheres should be rotated 180°
D.Flinders bar should be moved to the opposite side of the binnacle
A.Flinders bar
B.Soft iron spheres
C.Fore-and-aft permanent magnets in their trays
D.Heeling magnet
A.Magnetic materials of the same polarity repel each other and those of opposite polarity attract
B.The Earth's magnetic lines of force are parallel to the surface of the Earth
C.Magnetic meridians connect points of equal magnetic variation
D.The compass needle（s）will，when properly compensated，lie parallel to the isogonic lines of the Earth
A.Worn gears in the compass housing
B.Magnetism from the earth's magnetic field
C.Magnetism within the vessel
D.Lack of oil in the compass bearings
最新試題
The quadrantal spheres are used to（）.
The line which connects the points of zero magnetic dip is（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
What is an advantage of the magnetic compass aboard vessels?（）
When relieving the helm，the new helmsman should know the（）.
The Flinders bar on a magnetic compass compensates for the（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
Which compensates for errors introduced when the vessel heels over（）.
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
Variation in a compass is caused by（）.