A.frequent
B.so frequent
C.frequent that
D.so frequent that
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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
A.Summary of Corrections
B.Local Notice to Mariners
C.Daily Memorandum
D.Chart Correction Card
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That the scale of any part of a chart to be larger than the scale of the survey is（）.
The maximum difference between mean time and apparent time is （）.
Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.
The description Racon beside an illustration on a chart would mean a （）.
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
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?（）
A chart with a scale of 1:80，000 would fall into the category of a（）.
Every chart is liable to be incomplete（）.