A.will add to
B.will subtract from
C.may add to or subtract from
D.will not change
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A.an annual
B.a constant
C.a variable
D.an unstable
A.Remove deviation on the intercardinal headings
B.Remove deviation on the cardinal compass headings
C.Remove heeling error
D.Compensate for induced magnetism in vertical soft iron
A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
A.Comparing the gyro azimuth of a celestial body with the computed azimuth of the body
B.Comparing the gyro heading with the magnetic compass heading
C.Determining from the chart the course made good between celestial fixes
D.It cannot be determined accurately at sea due to drift of unknown currents
A.permanent magnetism
B.subpermanent magnetism
C.induced magnetism
D.variable magnetism
最新試題
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.
When relieving the helm，the new helmsman should know the（）.
What is the basic principle of the magnetic compass（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
When crossing the magnetic equator the（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
The Flinders bar on a magnetic compass compensates for the（）.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
Variation is the angular measurement between（）.