单项选择题

You should plot your dead reckoning position（）.

A.From every fix or running fix
B.From every estimated position
C.Every three minutes in pilotage waters
D.Only in pilotage waters

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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