A.compass error
B.variation
C.magnetic dip
D.deviation
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A.zero
B.equal to variation
C.eliminated by adjusting the compass
D.constant at any geographical location
A.geographical position
B.speed
C.heading
D.longitude
A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings
A.induced magnetism in the vessel's horizontal soft iron
B.change in the magnetic field when the vessel inclines from vertical
C.permanent magnetism of the vessel
D.magnetic fields caused by electrical currents in the vicinity
A.the vessel's heading
B.sea conditions
C.seasons
D.the vessel's position
最新試題
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（）.
Which compensates for errors introduced when the vessel heels over（）.
This induced magnetism（）the permanent magnetism already present in the ship.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
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 used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.