A.frequent
B.so frequent
C.frequent that
D.so frequent that
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A.To consider
B.To check
C.To examine
D.To agree with
A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection
A.after every major hydrographic survey of the area covered by the chart
B.when there are numerous corrections to be made or the corrections are extensive
C.when a low-stock situation occurs and minor corrections are made
D.every two years to update the magnetic variation information
A.Mercator projection
B.polyconic projection
C.orthographic projection
D.gnomonic projection
A.Summary of Corrections
B.Local Notice to Mariners
C.Daily Memorandum
D.Chart Correction Card
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The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
The short-long dashed magenta line around Gardiners Island marks（）.
What information is found in the chart title? （）
A chart position enclosed by a square is a（n）（）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
（）is not a position-fixing system.
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
A chart projection depicting the poles and a small area on either side of a connecting meridian，that is sometimes used for star charts，is the（）.
The soundings on the chart are based on the depth of water available at （）.