單項(xiàng)選擇題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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1.單項(xiàng)選擇題Which position includes the effects of wind and current（）.

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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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