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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相关考题
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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 -
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
