A.From every fix or running fixB.From every estimated p……

单项选择题You have been informed that dredging operations may be underway in your vicinity.Which buoy indicates the dredging area（）.

A.White buoy with a green top
B.White and international orange buoy
C.Yellow buoy
D.Yellow and black vertically-striped buoy

单项选择题You determine your vessel’s position by taking a range and bearing to a buoy.Your position will be plotted as a（n）（）.

A.Running fix
B.Fix
C.Dead-reckoning position
D.Estimated position

单项选择题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

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

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