🔍 Key Concepts

• SafetyNET is the international service for broadcasting Maritime Safety Information (MSI) via satellite under the GMDSS. • How Inmarsat-C and EGC (Enhanced Group Call) are used to receive MSI and safety broadcasts. • The specific roles of NAVTEX, VHF DSC, and HF NBDP (SITOR) in GMDSS and which actually carry SafetyNET vs other MSI services.

💭 Think About

• Which GMDSS system is explicitly designed for satellite broadcast of MSI on the high seas? Focus on the link between that system and SafetyNET. • For each option, ask: does this system receive satellite broadcast MSI, or coast-station broadcasts by radio (MF/HF/VHF)? • Think about where NAVTEX fits: is NAVTEX the same as SafetyNET, or is it a different MSI broadcast service with its own frequencies and format?

✅ Before You Answer

• Confirm which equipment uses Enhanced Group Call (EGC) for receiving satellite MSI broadcasts. • Verify on a GMDSS diagram which methods are labeled specifically under SafetyNET versus NAVTEX or HF MSI. • Check which options mention satellite-based services as opposed to terrestrial radio services (MF/HF/VHF).