A.very rare
B.common
C.often
D.reasonable
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A.SW of Cocos Islands
B.oceanic dangers or seamounts
C.undiscovered dangers
D.the continental shelf
A.a small error in bearing or in laying it down on the chart has a greater effect in misplacing the position the longer the line to be drawn
B.all scales are kept updated for vital information by Notices to Mariners
C.the larger the scale of the chart，the greater the detail that can be shown on it
D.the mariner using the medium scale charts for passage along a coast need not transfer on to a large scale for short distances
A.1 minute of longitude
B.1 degree of longitude
C.1 minute of latitude
D.1 degree of latitude
A.the final judge of the reliance the mariner can place on the information given
B.its immediate importance cannot always be verified before promulgation
C.through imperfections in the survey on which it is based，or subsequent alterations to the topography or sea floor
D.deferring the promulgation of certain less important information
A.National Geospatial-Intelligence Agency
B.Coast Guard
C.Naval Observatory
D.National Ocean Service
最新試題
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
Which aid is NOT marked on a chart with a magenta circle? （）
What information is found in the chart title? （）
The maximum difference between mean time and apparent time is （）.
Which information does the outer ring of a compass rose on a nautical chart provide（）.
The soundings on the imperial chart are measured in（）.
Every chart is liable to be incomplete（）.
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 （）.
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．