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
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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
A.Mercator
B.Gnomonic
C.Azimuthal
D.Lambert conformal
A.keep the buoy on the vessel's starboard side when approaching a port and on the vessel's port side when leaving
B.keep the buoy on the vessel's port side when approaching a port and on the vessel's starboard side when leaving
C.keep the buoy on the vessel's starboard side when approaching and leaving
D.keep the buoy on the vessel's port side when approaching and leaving
A.magenta
B.deep red
C.bright red
D.red
最新試題
Which buoy will NOT display white retro reflective material（）.
The points on the earth’s surface where the magnetic dip is 90° are（）.
When using a buoy as an aid to navigation which of the following should be considered?（）
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（）.
A celestial body will cross the prime vertical circle when the latitude is numerically （）.
Which position includes the effects of wind and current（）.
（） is not likely to be a methods of Traffic Separation.
Depiction of TSS's on charts uses（）as the primary color.
What is a lighted safe water mark fitted with to aid in its identification（）.