A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection
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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
A.Gray lines on the uppermost inset chart
B.Red lines on the main body of the chart
C.In parenthesis on the lines of equal magnetic variation
D.Annual rate of change is not shown
最新試題
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
Which chart symbol indicates the bottom is clay（）.
What is NOT an advantage of the rhumb line track over a great circle track? （）
What information is NOT found in the chart title? （）
Which aid is NOT marked on a chart with a magenta circle? （）
The soundings on the chart are based on the depth of water available at （）.
Particular care is needed when navigating in the vicinity of（）as very few of these features have been fully surveyed to modern standards to determine their correct position，full extent，or the least depth over them.
The soundings on the imperial chart are measured in（）.
Charts showing the coast of Mexico are produced by the United States（）.
What defines a great circle? （）