A.on a regional basis
B.on a national basis
C.shown orderly
D.appeared from A to W
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A.very rare
B.common
C.often
D.reasonable
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
最新試題
The revision date of a chart is printed on which area of the chart? ()
A chart with a scale of 1:80,000 would fall into the category of a().
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?()
On chart,bearings to near objects should be used in preference to objects farther off,because().
Charts showing the coast of Mexico are produced by the United States().
Which chart symbol indicates the bottom is clay().
When using a Lambert conformal chart in high latitudes,angles such as bearings are measured in reference to ().
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.
Which information does the outer ring of a compass rose on a nautical chart provide().
The only cylindrical chart projection widely used for navigation is the ().