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
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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
A.broadcast
B.broadcasted
C.are broadcast
D.are broadcasted
A.SafetyNET
B.NAVTEX
C.NAVAREA
D.VHF R/T
A.conduction fog
B.radiation fog
C.frontal fog
D.advection fog
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In revised editions of Admiralty charts the（）are corrected first．
Section V of the ADMIRALTY NOTICES TO MARINERS is（）.
Periodic publications notifying changes in，or additions to，previously published navigational data are（）.
On a nautical chart，the inner ring of a compass rose indicates（）.
Information for updating nautical charts is primarily found in the（）.
Navigational warnings and weather bulletins for shipping（）from Singapore Radio.
The charts show two dashed lines crossing the river justsouth of St. Catherine Bar Light. What does this indicate? （）
For what purpose would using a Lambert conformal chart be more convenient than using a Mercator?（）
On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a（）.
Which is a weekly publication advising mariners of important matters affecting navigational safety（）.