單項選擇題Many navigational warnings are of a temporary nature,but others remain in force for several months or may be succeeded by().

A.Notices to Mariners
B.Sailing Directions
C.List of Lights and Signals
D.Guide to Port Entries


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3.單項選擇題Information for updating nautical charts is primarily found in the().

A.Notice to Mariners
B.Coast Pilots
C.nautical chart catalogs
D.Sailing Directions

4.單項選擇題In revised editions of Admiralty charts the()are corrected first.

A.smaller scales
B.larger scales
C.smaller scales and larger scales
D.moderate scales

5.單項選擇題Generally,()are used as the track charts on the high sea,()are used for harbors,inland waters and coastal areas.

A.Mercator charts/Loran charts
B.Admiralty charts/Routeing charts
C.large scale charts/small scale charts
D.small scale charts/large scale charts