A.zero
B.equal to variation
C.eliminated by adjusting the compass
D.constant at any geographical location
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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
A.compass error
B.true heading
C.variation
D.deviation
最新試題
When adjusting a magnetic compass for error，a deviation table should be made（）.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
The most accurate method of determining gyrocompass error while underway is by（）.
When changing from a compass course to a true course you should apply（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
Which compensates for errors introduced when the vessel heels over（）.
Variation is a compass error that you（）.
Variation in a compass is caused by（）.