A.mean low water
B.mean lower low water
C.mean high water
D.mean high water springs
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A.Top center
B.Lower-left corner
C.Part of the chart title
D.Any clear area around the neat line
A.DR plot
B.track line
C.heading
D.estimated course
A.Lambert conformal
B.Mercator
C.azimuthal
D.gnomonic
A.total number of observations
B.average wind force on the Beaufort scale
C.average wind force in knots
D.percentage of calms
A.equal to the longitude expressed in time units
B.about 16 minutes
C.the difference between the GHA of mean sun and the first point of Aries
D.15°of arc
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On a Mercator chart，1 nautical mile is equal to（）.
Charts showing the coast of Mexico are produced by the United States（）.
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
The description Racon beside an illustration on a chart would mean a （）.
The short-long dashed magenta line around Gardiners Island marks（）.
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
A chart with a scale of 1:80，000 would fall into the category of a（）.
The only cylindrical chart projection widely used for navigation is the （）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
The path that a vessel is expected to follow，represented on a chart by a line drawn from the point of departure to the point of arrival，is the（）.