Inmarsat-C broadcast service for distributing safety, navigational, and security messages to ships in defined geographic areas.
Regulatory detail & full definition
Two services: SafetyNET (free, MSI broadcasts) and FleetNET (commercial, fee). Carries equivalent of NAVTEX for vessels outside NAVTEX coverage. Receivers print the message and log receipt; required logging under SOLAS Ch. IV. Iridium SafetyCAST has emerged as an alternative service.