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
最新試題
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
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?（）
The survey information upon which a chart is based is found （）.
A chart position enclosed by a square is a（n）（）.
The soundings on the imperial chart are measured in（）.
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（）.
Which information is found in the chart title（）.
On a Mercator chart，1 nautical mile is equal to（）.
What information is NOT found in the chart title? （）
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．