單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題If the compass heading and the 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