单项选择题

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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单项选择题

Which buoy will NOT display white retro reflective material（）.

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

单项选择题

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