A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings
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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
A.varies depending upon the bearing used
B.is the angular difference between magnetic north and compass north
C.is published on the compass rose on most nautical charts
D.is the angular difference between geographic and magnetic meridians
最新試題
What is the basic principle of the magnetic compass?（）
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
When crossing the magnetic equator the（）.
The most accurate method of determining gyrocompass error while underway is by（）.
The Flinders bar on a magnetic compass compensates for the（）.
The line which connects the points of zero magnetic dip is（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
Variation in a compass is caused by（）.
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 the name of the movable，radial guide line used to measure direction on a radar?（）