A.Comparing the gyro azimuth of a celestial body with the computed azimuth of the body
B.Comparing the gyro heading with the magnetic compass heading
C.Determining from the chart the course made good between celestial fixes
D.It cannot be determined accurately at sea due to drift of unknown currents
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A.permanent magnetism
B.subpermanent magnetism
C.induced magnetism
D.variable magnetism
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
最新試題
What is an advantage of the magnetic compass aboard vessels?（）
Which compensates for errors introduced when the vessel heels over（）.
The Flinders bar on a magnetic compass compensates for the（）.
What is the basic principle of the magnetic compass?（）
By convention，the north seeking ends of a compass’ magnets are colored（）.
Variation is a compass error that you（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
When crossing the magnetic equator 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（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.