Variation is a compass error that you（）.

Your vessel is proceeding down a channel，and you see a pair of range lights that are in line dead ahead．The chart indicates that the direction of this pair of lights is 229°T，and variation is 6°W．If the heading of your vessel at the time of the sighting is 232°per standard magnetic compass，what is the correct deviation ________．

A.3°E

B.9°E

C.3°W

D.9°W

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

The compass error of a magnetic compass that has no deviation is ______.

A.zero

B.equal to variation

C.eliminated by adjusting the compass

D.constant at any geographical location

How is variation indicated on a small-scale nautical chart?______.

A.Magnetic compass table

B.Magnetic meridians

C.Isogonic lines

D.Variation is not indicated on small-scale nautical charts

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°

Error may be introduced into a magnetic compass by ______.

A.making a structural change to the vessel

B.a short circuit near the compass

C.belt buckles

D.All of the above

The compass rose on a nautical chart indicates both variation and ______.

A.deviation

B.annual rate of variation change

C.precession

D.compass error

If a magnetic compass is not affected by any magnetic field other than the Earth’s which statement is TRUE?______.

A.Compass error and variation are equal

B.Compass north will be true north

C.Variation will equal deviation

D.There will be no compass error