You will find information about the duration of slack water in the （）.

（）amplify charted detail and contain information needed for safe navigation.

A.Admiralty Sailing Directions
B.Admiralty List of Lights
C.Admiralty List of Signals
D.Admiralty Notices to Mariners

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Admiralty Sailing Directions are Kept up to date by （）.

A.corrections
B.publications
C.supplements
D.alterations

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