A.Flinders bar
B.Soft iron spheres
C.Fore-and-aft permanent magnets in their trays
D.Heeling magnet
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A.Magnetic materials of the same polarity repel each other and those of opposite polarity attract
B.The Earth's magnetic lines of force are parallel to the surface of the Earth
C.Magnetic meridians connect points of equal magnetic variation
D.The compass needle(s)will,when properly compensated,lie parallel to the isogonic lines of the Earth
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
A.will add to
B.will subtract from
C.may add to or subtract from
D.will not change
A.an annual
B.a constant
C.a variable
D.an unstable
A.Remove deviation on the intercardinal headings
B.Remove deviation on the cardinal compass headings
C.Remove heeling error
D.Compensate for induced magnetism in vertical soft iron
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The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is().
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While in drydock your vessel will be belt-gauged.This process involves().
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Variation in a compass is caused by().