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
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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
A.Chart No.1
B.Catalog of Charts
C.IMO Practical Navigator
D.IMO Light List
最新試題
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 survey information upon which a chart is based is found （）.
The maximum difference between mean time and apparent time is （）.
The revision date of a chart is printed on which area of the chart? （）
That the scale of any part of a chart to be larger than the scale of the survey is（）.
The short-long dashed magenta line around Gardiners Island marks（）.
A chart with a scale of 1:80，000 would fall into the category of a（）.
What defines a great circle? （）
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
The soundings on the imperial chart are measured in（）.