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
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相关考题
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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
