A.variation
B.deviation
C.compass error
D.drift
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A.compass error
B.variation
C.magnetic dip
D.deviation
A.zero
B.equal to variation
C.eliminated by adjusting the compass
D.constant at any geographical location
A.geographical position
B.speed
C.heading
D.longitude
A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings
A.induced magnetism in the vessel's horizontal soft iron
B.change in the magnetic field when the vessel inclines from vertical
C.permanent magnetism of the vessel
D.magnetic fields caused by electrical currents in the vicinity
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Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
What is the basic principle of the magnetic compass?（）
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
When relieving the helm，the new helmsman should know the（）.
Variation in a compass is caused by（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
The quadrantal spheres are used to（）.
The line which connects the points of zero magnetic dip is（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.