A.DR plot
B.track line
C.heading
D.estimated course
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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
A.radar conspicuous beacon
B.circular radiobeacon
C.radar transponder beacon
D.radar calibration beacon
A.deviation
B.annual rate of variation change
C.precession
D.compass error
最新試題
A chart with a scale of 1:80，000 would fall into the category of a（）.
（）is not a position-fixing system.
The maximum difference between mean time and apparent time is （）.
The shoreline on charts generally represents the mean（）.
Charts showing the coast of Mexico are produced by the United States（）.
Every chart is liable to be incomplete（）.
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?（）
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
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 numeral in the center of a wind rose circle on a pilot chart indicates the （）.