Magnetic materials of the same polarity repel each other and those of opposite polarity attract
The Earth's magnetic lines of force are parallel to the surface of the Earth
Magnetic meridians connect points of equal magnetic variation
The compass needle（s）will，when properly compensated，lie parallel to the isogonic lines of the Earth
第1题：
A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?
A.Move the quadrantal spheres closer to the compass
B.Raise the heeling magnet if the red end is up
C.Remove some of the Flinders bar
D.Raise or lower the athwartship magnets
第2题：
If a magnetic compass is not affected by any magnetic field other than the Earth’s which statement is TRUE?______.
A.Compass error and variation are equal
B.Compass north will be true north
C.Variation will equal deviation
D.There will be no compass error
第3题：
Which one of the followings is incorrect about magnetic compass?______.
A.The magentic compass is compulsory on my vessel
B.The magentic compass is prone to error
C.The magentic compass is always placed inside steel constructions
D.The magentic compass needs to be calibrated to compensate for local magnetic distortion
第4题：
magnetism from the earth's magnetic field
misalignment of the compass
magnetism within the vessel
a dirty compass housing
第5题：
Magnetic heading differs from compass heading by______．
A.compass error
B.true heading
C.variation
D.Deviation
第6题：
Deviation is the angle between the ______.
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
第7题：
Magnetic compass deviation______．
A.varies depending upon the bearing used
B.is the angular difference between magnetic north and compass north
C.is published on the compass rose on most nautical charts
D.is the angular difference between geographic and magnetic meridians
第8题：
On a nautical chart，the inner ring of a compass rose indicates ______.
A.true directions
B.compass error
C.deviation
D.magnetic directions
第9题：
Magnetic dip is a measurement of the angle between the ______.
A.geographic pole and the magnetic pole
B.lubber’s line and true north
C.horizontal and the magnetic line of force
D.compass heading and the magnetic heading
第10题：
north magnetic pole
south magnetic pole
magnetic prime vertical meridian
magnetic equator