A.worn gears in the compass housing
B.magnetism from the earth's magnetic field
C.magnetism within the vessel
D.lack of oil in the compass bearings
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A.deviation
B.variation
C.compass error
D.northerly error
A.the compass heading is in line with the lubber's line
B.there is no lost motion in the gimbal rings
C.no change of heading by compass is observed if you raise and lower the heeling magnet
D.the gimbal rings do not strike the compass frame when they are tilted
A.The Flinders bar
B.The heeling magnet
C.Quadrantal soft iron spheres
D.Bar magnets in the binnacle
A.elevation
B.magnetic angle
C.vertical angle
D.dip
A.divisional parts
B.coefficients
C.fractional parts
D.equations
最新試題
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
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 MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
This induced magnetism（）the permanent magnetism already present in the ship.
When adjusting a magnetic compass for error，a deviation table should be made（）.