A.Course-planning
B.Position-fixing
C.Radar-plotting
D.Stowage-plan making
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A.frequent
B.so frequent
C.frequent that
D.so frequent that
A.To consider
B.To check
C.To examine
D.To agree with
A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection
A.after every major hydrographic survey of the area covered by the chart
B.when there are numerous corrections to be made or the corrections are extensive
C.when a low-stock situation occurs and minor corrections are made
D.every two years to update the magnetic variation information
A.Mercator projection
B.polyconic projection
C.orthographic projection
D.gnomonic projection
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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（）.
Every chart is liable to be incomplete（）.
Charts showing the coast of Mexico are produced by the United States（）.
A chart position enclosed by a square is a（n）（）.
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.
Which information does the outer ring of a compass rose on a nautical chart provide（）.
On a Mercator chart，1 nautical mile is equal to（）.
The soundings on the imperial chart are measured in（）.
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.