SafetyNET
Inmarsat Enhanced Group Call service used to broadcast Maritime Safety Information to GMDSS Sea Areas A3 and A4.
In practice
Inmarsat-C terminal prints SafetyNET broadcasts automatically. OOW logs and updates passage plan; periodic system tests verify reception.
Regulatory detail & full definition
Inmarsat Enhanced Group Call SafetyNET service, used to broadcast Maritime Safety Information (MSI) to GMDSS Sea Areas A3 and A4 where NAVTEX cannot reach. SafetyNET broadcasts navigational warnings, meteorological warnings, search-and-rescue information, and pilot service messages to all ships in a defined geographic area. IMO Resolution A.1051(27) sets the service standards. Inmarsat-C terminals (and from 2025 Iridium SafetyCast) receive EGC; the receiver auto-decodes and prints messages relevant to the ship's position. Ships moving between NAVAREAs receive automatic re-registration.
Authoritative source: IMO Resolutions Index ↗
Related
Source: IMO Resolution A.1051(27)
High confidence
Editorial confidence: how we grade.