A.White buoy with a green top
B.White and international orange buoy
C.Yellow buoy
D.Yellow and black vertically-striped buoy
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A.Running fix
B.Fix
C.Dead-reckoning position
D.Estimated position
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
A.Dead reckoning position
B.Leeway position
C.Estimated position
D.Set position
A.ECDIS warnings and messages
B.Hydrographic Office data
C.Notice to Mariners information
D.All of the above
A.Safe water mark
B.Isolated danger mark
C.Preferred channel mark
D.Daymark of no lateral significance
最新試題
What is an ebb current（）.
When latitude and longitude are used，these shall be expressed in（）（and decimals of a minute if necessary），north or south of the Equator and east or west of Greenwich.
（） is a circular traffic lane used at junctions of several routes，within which traffic moves counterclockwise around a separation point or zone.
When navigating a vessel，you（）.
When using a buoy as an aid to navigation which of the following should be considered?（）
When navigating a vessel，you（）.
What is a lighted safe water mark fitted with to aid in its identification（）.
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.
In very high latitudes，the most practical chart projection is the（）.
The points on the earth’s surface where the magnetic dip is 90° are（）.