單項選擇題

A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts

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

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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