A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
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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
A.An agonic line
B.The magnetic equator
C.A magnetic meridian
D.All of the above
A.They are not subject to permanent magnetism; no check is necessary
B.Semiannually
C.Annually
D.Every five years
A.Induced magnetism in vertical soft iron
B.Induced magnetism in horizontal soft iron
C.Permanent magnetism in ship's steel
D.Vessel's inclination from the vertical
最新試題
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
Which compensates for errors introduced when the vessel heels over（）.
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.
Variation in a compass is caused by（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
The line which connects the points of zero magnetic dip is（）.
What is an advantage of the magnetic compass aboard vessels?（）
What is the basic principle of the magnetic compass（）.