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
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
What is the basic principle of the magnetic compass?（）
When changing from a compass course to a true course you should apply（）.
When adjusting a magnetic compass for error，a deviation table should be made（）.
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（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
The Flinders bar on a magnetic compass compensates for the（）.
Variation in a compass is caused by（）.