A.compass error
B.latitude
C.variation
D.deviation
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A.precession
B.earth rate
C.gyroscopic inertia
D.gravity effect
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.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
最新試題
What is the basic principle of the magnetic compass（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
Variation in a compass is caused by（）.
What is an advantage of the magnetic compass aboard vessels?（）
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
When changing from a compass course to a true course you should apply（）.
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（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
Which compensates for errors introduced when the vessel heels over（）.