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
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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
A.complete and often very poor surveys
B.correct and often very good surveys
C.inadequate and often very old surveys
D.adequate and present surveys
最新試題
Which aid is NOT marked on a chart with a magenta circle? （）
What information is NOT found in the chart title? （）
What defines a great circle? （）
The arrangement of charts in the catalogue is（）.
The short-long dashed magenta line around Gardiners Island marks（）.
That the scale of any part of a chart to be larger than the scale of the survey is（）.
The soundings on the chart are based on the depth of water available at （）.
What is NOT an advantage of the rhumb line track over a great circle track? （）
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
A chart with a scale of 1:80，000 would fall into the category of a（）.