A.increases with latitude，being maximum at the geographic poles
B.decreases with latitude，being maximum at the geographic equator
C.is greatest when a vessel is near the Earth's magnetic equator
D.remains the same at all latitudes
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A.variation
B.deviation
C.compass error
D.drift
A.compass error
B.variation
C.magnetic dip
D.deviation
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
最新試題
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
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（）.
The quadrantal spheres are used to（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
What is the basic principle of the magnetic compass?（）
What is an advantage of the magnetic compass aboard vessels?（）
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.