A.magnetic latitudes
B.magnetic declinations
C.dip
D.isogonic lines
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A.complete and often very poor surveys
B.correct and often very good surveys
C.inadequate and often very old surveys
D.adequate and present surveys
A.equipment's
B.tools
C.apparatus
D.aids
A.with
B.in
C.by
D.to
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The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
That the scale of any part of a chart to be larger than the scale of the survey is（）.
The arrangement of charts in the catalogue is（）.
Charts showing the coast of Mexico are produced by the United States（）.
What is NOT an advantage of the rhumb line track over a great circle track? （）
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 maximum difference between mean time and apparent time is （）.
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?（）
Every chart is liable to be incomplete（）.
The only cylindrical chart projection widely used for navigation is the （）.