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
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A.will add to
B.will subtract from
C.may add to or subtract from
D.will not change
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
最新試題
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.
The quadrantal spheres are used to（）.
What is the basic principle of the magnetic compass（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
The most accurate method of determining gyrocompass error while underway is by（）.
Which compensates for errors introduced when the vessel heels over（）.
What is the basic principle of the magnetic compass?（）
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.