A.Reprints of Radio Navigational Warnings B.Amendments to Admiralty Sailing Directions C.Amendments to Admiralty Lists of Lights and Fog Signals D.Amendments to Admiralty List of Radio Signals
A.Chart Number only B.Chart Number + Previous NM Number/Year C.Chart Number + Between Previous and Present Dates D.Cumulative Number
A.as soon as possible B.prior to its publication C.in advance of any possible accident D.by means of other than airmails