A.Summary of Corrections
B.Local Notice to Mariners
C.Daily Memorandum
D.Chart Correction Card
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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
A.points of equal variation
B.points of zero variation
C.the magnetic latitude
D.magnetic dip
A.magnetic latitudes
B.magnetic declinations
C.dip
D.isogonic lines
最新試題
What information is found in the chart title? （）
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.
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?（）
A chart position enclosed by a square is a（n）（）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
The only cylindrical chart projection widely used for navigation is the （）.
Which chart symbol indicates the bottom is clay（）.
The soundings on the imperial chart are measured in（）.
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
The shoreline on charts generally represents the mean（）.