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
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.
What is the basic principle of the magnetic compass?（）
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
This induced magnetism（）the permanent magnetism already present in the ship.
When a magnetic compass is not in use for a prolonged period of time it should（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
Variation in a compass is caused by（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
When changing from a compass course to a true course you should apply（）.