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? （）
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
（）is not a position-fixing system.
Every chart is liable to be incomplete（）.
The soundings on the chart are based on the depth of water available at （）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
That the scale of any part of a chart to be larger than the scale of the survey is（）.
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.
The short-long dashed magenta line around Gardiners Island marks（）.
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.