单项选择题
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
A.an annual
B.a constant
C.a variable
D.an unstable
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单项选择题
The quadrantal spheres are used to（）.
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 -
单项选择题
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel -
单项选择题
The most accurate method of determining gyrocompass error while underway is by（）.
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
