A.permanent magnetism
B.subpermanent magnetism
C.induced magnetism
D.variable magnetism
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A.An agonic line
B.The magnetic equator
C.A magnetic meridian
D.All of the above
A.They are not subject to permanent magnetism; no check is necessary
B.Semiannually
C.Annually
D.Every five years
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
A.GPS
B.GMDSS
C.AIS
D.Navtex
A.Black
B.Blue
C.Red
D.White
最新試題
This induced magnetism（）the permanent magnetism already present in the ship.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
Which statement about the gyrocompass is FALSE（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
Which compensates for errors introduced when the vessel heels over（）.
Variation is the angular measurement between（）.
The quadrantal spheres are used to（）.
The Flinders bar on a magnetic compass compensates for the（）.
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（）.