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
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相关考题
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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
