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
A chart position enclosed by a square is a（n）（）.
Which information is found in the chart title（）.
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
The soundings on the chart are based on the depth of water available at （）.
Which information does the outer ring of a compass rose on a nautical chart provide（）.
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.
What information is found in the chart title? （）
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.