单项选择题

A.Current can be determined by measuring the direction ……

Which statement concerning current is TRUE（）.

A.Current can be determined by measuring the direction and distance between simultaneous EP and DR positions
B.The drift of the current should be averaged out on a one hour basis
C.After the current is determined，it should not be used for further plotting because it is an unknown variable
D.The distance between a simultaneous DR position and fix is equal to the drift of the current

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单项选择题Which position includes the effects of wind and current（）.

A.Dead reckoning position
B.Leeway position
C.Estimated position
D.Set position

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A.ECDIS warnings and messages
B.Hydrographic Office data
C.Notice to Mariners information
D.All of the above

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A.Safe water mark
B.Isolated danger mark
C.Preferred channel mark
D.Daymark of no lateral significance

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A.The objects lie in a straight line
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C.The vessel is outside of a triangle formed by the objects
D.A circle will pass through your position and the three objects

单项选择题When navigating a vessel，you（）.

A.Can always rely on a buoy to be on station
B.Can always rely on a buoy to show proper light characteristics
C.Should assume a wreck buoy is directly over the wreck
D.Should never rely on a floating aid to maintain its exact position