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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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
Due to GPS roll over of the clock cycle，GPS receivers may give the wrong time and position or may lock up permanently on（）.

A.21-Aug-99
B.21-Sep-99
C.Octoer 31，1999
D.31-Dec-99
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