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
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
Variation in a compass is caused by（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
The most accurate method of determining gyrocompass error while underway is by（）.
What is an advantage of the magnetic compass aboard vessels?（）
When crossing the magnetic equator the（）.
The quadrantal spheres are used to（）.
This induced magnetism（）the permanent magnetism already present in the ship.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）