A.Errors due to unusual parallax are eliminated
B.The same body can be used for a fix from observations separated by several minutes
C.The declination is the only information needed from the almanac
D.The semidiameter correction of the sextant altitude is eliminated
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A.Group flashing
B.Composite group flashing
C.Interrupted quick flashing
D.Fixed and flashing
A.Red buoy with a horizontal yellow band
B.Red and white vertically-striped buoy with a vertical yellow stripe
C.Red and white vertically-striped buoy with a red spherical topmark
D.Green buoy with a yellow square
A.Dead-reckoning position
B.Estimated position
C.Fix
D.Running fix
A.encountered
B.met
C.contacted
D.seen
A.the differing light colors
B.one system having odd numbers while the other system has even numbers
C.one system using horizontal bands while the other system uses vertical stripes
D.the difference in the periods of the light
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（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
What area of the earth cannot be shown on a standard Mercator chart（）.
The equator is（）.
In very high latitudes，the most practical chart projection is the（）.
When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.
When entering a channel from seaward，the numbers on buoys（）.
Restricted areas at locks and dams are indicated by（）.
Which position includes the effects of wind and current（）.
Which statement concerning current is TRUE（）.
When using a buoy as an aid to navigation which of the following should be considered?（）