A.true meridian and the axis of the compass cardB.true ……

单项选择题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

单项选择题Gyrocompass repeaters reproduce the indications of the master gyrocompass. They are（）.

A.accurate only in the Polar regions
B.accurate electronic servomechanisms
C.hand operated
D.accurate only if the vessel is underway

单项选择题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

单项选择题If（）is shut down for an extended time optimum position fixing will take up to 2 hours after power is reapplied．

A.radar
B.DF
C.Satellite Navigator
D.Automatic Omega Navigator

单项选择题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