This manual provides a practical guide for anyone who is
concerned with drafting navigational warnings or with the issuance
of meteorological forecasts and warnings under the Global Maritime
Distress and Safety System (GMDSS). Maritime Safety Information (MSI)
is promulgated in accordance with the requirements of IMO resolution
A.705(17), as amended. Navigational warnings are issued under the
auspices of the IMO/International Hydrographic Organization (IHO)
World-Wide Navigational Warning Service (WWNWS) in accordance with
the requirements of IMO resolution A.706(17), as amended. Meteorological
forecasts and warnings are issued under the patronage of the World
Meteorological Organization (WMO). In order to achieve the necessary
impact on the mariner it is essential to present timely and relevant
information in a consistent format that is clear, unambiguous and
brief. Within this manual, it is particularly intended to provide
the best form of words for use in all types of navigational warnings
and meteorological forecasts and warnings that are required to be
broadcast in the English languagefootnote.
Note has been taken of the IMO Standard Marine Communication Phrases
(resolution A.918(22)), where appropriate.
This manual cannot provide specimen texts for every type of
event which may occur. However, the principles illustrated herein
may be applied in general to drafting messages for every kind of navigational
warning and covering all types of hazards and for the issuance of
meteorological forecasts and warnings.
Resolution A.706(17),
as amended on the World-Wide Navigational Warning Service (MSC.1/Circ.1288) at section 5.3.1, requires
that “All NAVAREA, Sub-Area and coastal warnings shall be broadcast
only in English in the International NAVTEX and SafetyNET services”.
Where this manual has been produced in languages other than English
then the message examples given in section 7 are also provided in
the English language in an additional annex.