单项选择题

A Mercator chart is a （）.

A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection

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单项选择题

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

单项选择题

All straight lines represent great circle tracks on a chart based on a(n) （）.

A.Mercator projection
B.polyconic projection
C.orthographic projection
D.gnomonic projection

单项选择题

Chart correction information is NOT disseminated through the （）.

A.Summary of Corrections
B.Local Notice to Mariners
C.Daily Memorandum
D.Chart Correction Card