A.precession
B.earth rate
C.gyroscopic inertia
D.gravity effect
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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
A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
最新試題
Variation in a compass is caused by().
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 is a compass error that you().
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 is the angular measurement between().
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called().
When crossing the magnetic equator the().
Which compensates for errors introduced when the vessel heels over().
A ship under construction or major repair will acquire permanent magnetism due to()while sitting stationary in the earth’s magnetic field.
When a magnetic compass is not in use for a prolonged period of time it should().