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
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.
That the scale of any part of a chart to be larger than the scale of the survey is（）.
What information is NOT found in the chart title? （）
When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?（）
The description Racon beside an illustration on a chart would mean a （）.
The shoreline on charts generally represents the mean（）.
The survey information upon which a chart is based is found （）.
On a Mercator chart，1 nautical mile is equal to（）.
A chart with a scale of 1:80，000 would fall into the category of a（）.