Magnetic heading differs from compass heading by______.A.compass errorB.true headingC.vari

The most accurate method of determining gyrocompass error while underway is by ______．

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

Heeling error is defined as the change of deviation for a heel of ______．

A.2° while the vessel is on an intercardinal heading

B.1° while the vessel is on a compass heading of 000°

C.2° and is constant on all headings

D.1° while the vessel is on a compass heading of 180°

A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?

A.Move the quadrantal spheres closer to the compass

B.Raise the heeling magnet if the red end is up

C.Remove some of the Flinders bar

D.Raise or lower the athwartship magnets

If the compass heading and magnetic-heading are the same then ______.

A.the deviation has been offset by the variation

B.there is something wrong with the compass

C.the compass is being influenced by nearby metals

D.there is no deviation on that heading

Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south ________．

A.Quadrantal spheres

B.Heeling magnets

C.Flinders bar

D.Fore-and-aft magnets

Compass error is equal to the ______.

A.deviation minus variation

B.variation plus compass course

C.combined variation and deviation

D.difference between true and magnetic heading

Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west ________．

A.Heeling magnet

B.Flinders bar

C.Fore-and-aft magnets

D.All of the above can be set on magnetic east or magnetic west headings

Magnetic dip is a measurement of the angle between the ______.

A.geographic pole and the magnetic pole

B.lubber’s line and true north

C.horizontal and the magnetic line of force

D.compass heading and the magnetic heading