A.compass north
B.the direction of the vessel's head
C.magnetic north
D.a relative bearing taken with an azimuth circle
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A.always shows true north direction
B.indicates the vessel's heading
C.is always parallel to the vessel's transom
D.is located on the compass card
A.deviation
B.variation
C.compass error
D.dip
A.damping error
B.ballistic deflection
C.quadrantal error
D.speed error
A.needles are nearly in line with the meridian
B.vessel is near the magnetic poles
C.variation is near zero
D.vessel is near the magnetic equator
A.induced magnetism in vertical soft iron
B.induced magnetism in horizontal soft iron
C.permanent magnetism in ship's steel
D.vessel's inclination from the vertical
最新試題
What is the basic principle of the magnetic compass?（）
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
Variation in a compass is caused by（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
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.
When relieving the helm，the new helmsman should know the（）.
The quadrantal spheres are used to（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
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（）.