A.mean low water
B.mean lower low water
C.mean high water
D.mean high water springs
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A.Top center
B.Lower-left corner
C.Part of the chart title
D.Any clear area around the neat line
A.DR plot
B.track line
C.heading
D.estimated course
A.Lambert conformal
B.Mercator
C.azimuthal
D.gnomonic
A.total number of observations
B.average wind force on the Beaufort scale
C.average wind force in knots
D.percentage of calms
A.equal to the longitude expressed in time units
B.about 16 minutes
C.the difference between the GHA of mean sun and the first point of Aries
D.15°of arc
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On a Mercator chart，1 nautical mile is equal to（）.
The soundings on the imperial chart are measured in（）.
That the scale of any part of a chart to be larger than the scale of the survey is（）.
The revision date of a chart is printed on which area of the chart? （）
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
The description Racon beside an illustration on a chart would mean a （）.
The arrangement of charts in the catalogue is（）.
What is NOT an advantage of the rhumb line track over a great circle track? （）
The only cylindrical chart projection widely used for navigation is the （）.
What defines a great circle? （）