A.An agonic line
B.The magnetic equator
C.A magnetic meridian
D.All of the above
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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
A.flux
B.poles
C.magnets
D.azimuth
最新試題
When adjusting a magnetic compass for error，a deviation table should be made（）.
The line which connects the points of zero magnetic dip is（）.
When relieving the helm，the new helmsman should know the（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
Variation is the angular measurement between（）.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
The Flinders bar on a magnetic compass compensates for the（）.