A.Orange
B.White
C.Red
D.Alternating yellow and white
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A.Three
B.Two
C.One
D.None
A.the lines of force cross the equator on a 0°-180°alignment
B.the quadrantal error is 0°
C.there is no vertical component of the Earth's magnetic field
D.the intercardinal headings have less than 1°
A.buoys close at hand
B.fixed known objects on shore
C.buoys at a distance
D.All of the above
A.running fix
B.fix
C.estimated position
D.assumed position
A.true north
B.magnetic north
C.the vessel's beam
D.the vessel's head
最新試題
You should plot your dead reckoning position（）.
On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector.The red sector（）.
When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.
When entering from seaward，a buoy displaying a single-flashing red light would indicate （）.
What is an ebb current（）.
Restricted areas at locks and dams are indicated by（）.
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.
Depiction of TSS's on charts uses（）as the primary color.
What area of the earth cannot be shown on a standard Mercator chart（）.
（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.