A.geographical position
B.speed
C.heading
D.longitude
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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
A.compass error
B.true heading
C.variation
D.deviation
A.geographic pole and the magnetic pole
B.lubber's line and true north
C.horizontal and the magnetic line of force
D.compass heading and the magnetic heading
最新試題
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
Variation is the angular measurement between（）.
The most accurate method of determining gyrocompass error while underway is 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（）.
When crossing the magnetic equator the（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
Which statement about the gyrocompass is FALSE（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.