A.To consider
B.To check
C.To examine
D.To agree with
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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
A.vertical distance from the chart sounding datum to the ocean bottom，plus the height of tide
B.vertical distance from the chart sounding datum to the ocean bottom
C.average height of water over a specified period of time
D.average height of all low waters at a place
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（）is not a position-fixing system.
The only cylindrical chart projection widely used for navigation is the （）.
That the scale of any part of a chart to be larger than the scale of the survey is（）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
The short-long dashed magenta line around Gardiners Island marks（）.
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（）.
What is NOT an advantage of the rhumb line track over a great circle track? （）
A chart position enclosed by a square is a（n）（）.
The soundings on the chart are based on the depth of water available at （）.
What information is found in the chart title? （）