A.SW of Cocos Islands
B.oceanic dangers or seamounts
C.undiscovered dangers
D.the continental shelf
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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
A.sailing chart
B.general chart
C.coastal chart
D.harbor chart
最新試題
Every chart is liable to be incomplete（）.
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
The shoreline on charts generally represents the mean（）.
On a Mercator chart，1 nautical mile is equal to（）.
The short-long dashed magenta line around Gardiners Island marks（）.
What is NOT an advantage of the rhumb line track over a great circle track? （）
Which chart symbol indicates the bottom is clay（）.
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
Charts showing the coast of Mexico are produced by the United States（）.