A.bottom contour only up to depths of 100 fathoms
B.depth underneath the keel against a time base
C.contour of the bottom against a distance base
D.depth of water against a distance base
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A.Along the magnetic equator
B.Connected by the isoclinal line
C.The isopors
D.The magnetic poles
A.purple
B.orange
C.blue
D.yellow
A.the primary great circle of the Earth perpendicular to the axis
B.the line to which all celestial observations are reduced
C.the line from which a celestial body's altitude is measured
D.All of the above
A.Flashing red lights upstream and fixed red lights downstream
B.Yellow unlighted buoys
C.Signs and/or flashing red lights
D.Red daymarks upstream and green daymarks downstream
A.Indicates the limits of the navigable channel
B.Indicates a danger area
C.Is used to identify the characteristics of the light
D.Serves no significant purpose
最新試題
When entering a channel from seaward，the numbers on buoys（）.
You have been informed that dredging operations may be underway in your vicinity.Which buoy indicates the dredging area（）.
You determine your vessel’s position by taking a range and bearing to a buoy.Your position will be plotted as a（n）（）.
Traffic separation schemes adopted by the IMO are listed in（）.
You should plot your dead reckoning position（）.
When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.
What area of the earth cannot be shown on a standard Mercator chart（）.
When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.
What is an ebb current（）.
Restricted areas at locks and dams are indicated by（）.