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
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A.reduce the variation as much as possible
B.reduce the deviation as much as possible
C.reduce the magnetic dip as much as possible
D.allow the compass bowl to swing freely on its gimbals
A.a collision with another vessel
B.being moored on a constant heading for a long period of time
C.being struck by lightning
D.All of the above
A.being moored for a long time on one heading
B.being struck by lighting
C.steaming from the north magnetic hemisphere to the south magnetic hemisphere
D.loading a homogenous magnetic cargo such as steel plate，iron bars，etc
A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
A.like magnetic poles attract
B.unlike magnetic poles repel
C.unlike poles attract
D.the poles of the compass line up with the geographic poles of the earth
最新試題
Variation is a compass error that you（）.
A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°.Which action should be taken to remove this error during compass adjustment（）.
Variation in a compass is caused by（）.
When changing from a compass course to a true course you should apply（）.
Which compensates for errors introduced when the vessel heels over（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.