A.total number of observations
B.average wind force on the Beaufort scale
C.average wind force in knots
D.percentage of calms
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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
A.newly edition with up to date correction and in reasonable prices
B.the current edition and incorporate the last Notices to Mariners correction
C.the current edition and incorporate the latest Notices to Mariners correction at the time of sale
D.brand-new one with up to date correction and clean writing
A.C
B.Cl
C.Co
D.c
最新試題
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
（）is not a position-fixing system.
Charts showing the coast of Mexico are produced by the United States（）.
A chart projection depicting the poles and a small area on either side of a connecting meridian，that is sometimes used for star charts，is the（）.
The path that a vessel is expected to follow，represented on a chart by a line drawn from the point of departure to the point of arrival，is the（）.
Every chart is liable to be incomplete（）.
The revision date of a chart is printed on which area of the chart? （）
Which aid is NOT marked on a chart with a magenta circle? （）
That the scale of any part of a chart to be larger than the scale of the survey is（）.
Which chart symbol indicates the bottom is clay（）.