A.mark the position of a lost mooring
B.determine your vessel's sideslip underway
C.determine your speed through the water
D.indicate location of a man overboard
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A.Conspicuous
B.Permanent
C.Preliminary
D.Temporary
A.From
B.By
C.on
D.With
A.either，or
B.neither，nor
C.another，nor
D.other，or
A.Amendments to Admiralty Sailing Directions
B.Amendments to Admiralty List of Lights and Fog Signals
C.Amendments to Admiralty List of Radio Signals
D.Supplement to Guide to Port Entry
A.Admiralty Sailing Directions
B.Admiralty List of Signals
C.Mariner's Handbook
D.Admiralty Notices to Mariners
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Information for updating nautical charts is primarily found in the（）.
What is the most important source of information to be used in correcting charts and keeping them up to date（）.
Weekly NMs are available without subscription from appointed（）.
The fog most commonly encountered at sea is called（）.
Periodic publications notifying changes in，or additions to，previously published navigational data are（）.
On notification by Admiralty Notice to Mariners that a new edition of one of the books，or a new supplement to one，has been published，it should be obtained（）.
Navigational warnings and weather bulletins for shipping（）from Singapore Radio.
LOW AT 34N 135E ESLY SLWLY INTST NC．This description is most likely to be under the heading of（）.
Vessels should not anchor or trawl in the vicinity of pipelines and are（）in the pipeline area shown on the chart.
Navigational warnings are published according to（）.