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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Which of the following are data layer categories to be displayed on ECDIS（）．
A.ECDIS warnings and messages
B.Hydrographic Office data
C.Notice to Mariners information
D.All of the above -
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Which buoy will NOT display white retro reflective material（）.
A.Safe water mark
B.Isolated danger mark
C.Preferred channel mark
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When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.
A.The objects lie in a straight line
B.The vessel is inside of a triangle formed by the objects
C.The vessel is outside of a triangle formed by the objects
D.A circle will pass through your position and the three objects
