SafetyNET is an international automatic direct printing satellite-based service for the promulgation of Maritime Safety Information (MSI), navigational and meteorological warnings, meteorological forecasts, Search and Rescue (SAR) information and other urgent safety-related messages to ships and fulfills an integral role in the Global Maritime Distress and Safety System (GMDSS).

This Manual describes the structure and operation of the International SafetyNET Service. It is intended primarily for national Administrations and registered information providers, but may also be useful to the mariner who requires more operational information than is found in manufacturers' equipment manuals.

The third revision of the International SafetyNET Manual was circulated to IHO Member States, endorsed by COMSAR at its fourteenth session in March 2010 and subsequently approved by the MSC at its eighty-seventh session in May 2010. The amendments will come into force on 1 January 2012.