Maritime English
Meteorology

What is Dense Fog Advisory?

Dense Fog Advisory Warning issued when visibility expected below one-half nautical mile due to thick fog, requiring sound signals and speed reduction.

Source: IMO SMCP, STCW Convention, SOLAS, COLREG

How is “Dense Fog Advisory” Used in Practice?

USCG Sector San Francisco issues dense fog advisory for Golden Gate approaches; all vessels must maintain safe speed and sound signals per Rule 35.

Certification Exam Relevance

STCWMarlins TestISF WatchkeeperGMDSS

Who Needs to Know This Term?

  • Deck Officers
  • Engine Officers
  • Masters

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Frequently Asked Questions

What is Dense Fog Advisory?

Warning issued when visibility expected below one-half nautical mile due to thick fog, requiring sound signals and speed reduction.

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