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
The soundings on the imperial chart are measured in（）.
Which chart symbol indicates the bottom is clay（）.
Which information does the outer ring of a compass rose on a nautical chart provide（）.
A chart with a scale of 1:80，000 would fall into the category of a（）.
Every chart is liable to be incomplete（）.
What information is NOT found in the chart title? （）
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
The description Racon beside an illustration on a chart would mean a （）.
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
That the scale of any part of a chart to be larger than the scale of the survey is（）.