A.Running fix
B.Fix
C.Dead-reckoning position
D.Estimated position
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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
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
最新試題
The equator is（）.
What area of the earth cannot be shown on a standard Mercator chart（）.
Which of the following are data layer categories to be displayed on ECDIS（）．
Traffic separation schemes adopted by the IMO are listed in（）.
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.
Which statement concerning current is TRUE（）.
When entering a channel from seaward，the numbers on buoys（）.
What is a lighted safe water mark fitted with to aid in its identification（）.
（） is a circular traffic lane used at junctions of several routes，within which traffic moves counterclockwise around a separation point or zone.
What is an ebb current（）.