What is WWNWS (World-wide Navigation Warning Service)?

The WWNWS is a co-ordinated global service established through the joint efforts of the International Hydrographic Organization (IHO) and the International Maritime Organization (IMO) for the promulgation of navigational warnings. It is now also an integral part of the Global Maritime Distress and Safety System (GMDSS).

The service divides the world into 16 NAVAREAs, identified by Roman numerals. Each area is under the authority of an Area Co–ordinator to whom National Co–ordinators pass information deemed suitable for promulgation throughout the appropriate NAVAREA.