A.Set
B.Frequency
C.Period
D.Function
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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
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
最新試題
Which of the following are data layer categories to be displayed on ECDIS（）．
（） is a circular traffic lane used at junctions of several routes，within which traffic moves counterclockwise around a separation point or zone.
You determine your vessel’s position by taking a range and bearing to a buoy.Your position will be plotted as a（n）（）.
How would you pass a red buoy in the maritime buoyage system“A” （）.
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.
A celestial body will cross the prime vertical circle when the latitude is numerically （）.
When navigating a vessel，you（）.
（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
Depiction of TSS's on charts uses（）as the primary color.
The equator is（）.