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
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
What is NOT an advantage of the rhumb line track over a great circle track? （）
A chart position enclosed by a square is a（n）（）.
The only cylindrical chart projection widely used for navigation is the （）.
The soundings on the imperial chart are measured in（）.
On a Mercator chart，1 nautical mile is equal to（）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
The arrangement of charts in the catalogue is（）.
Which chart symbol indicates the bottom is clay（）.
Every chart is liable to be incomplete（）.