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
最新試題
A chart position enclosed by a square is a（n）（）.
On a Mercator chart，1 nautical mile is equal to（）.
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
What is NOT an advantage of the rhumb line track over a great circle track? （）
A chart with a scale of 1:80，000 would fall into the category of a（）.
When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?（）
Which chart symbol indicates the bottom is clay（）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
The soundings on the imperial chart are measured in（）.