Subelement F: Maritime Safety Information (M.S.I.)— Topic :
Question 42F1
Element 7R (GMDSS-RO)Over what system are Enhanced Group Calls transmitted?
Explanation
Enhanced Group Calls (EGC) are a crucial component of the Global Maritime Distress and Safety System (GMDSS) for broadcasting maritime safety information (MSI), such as navigational warnings, meteorological warnings, and search and rescue information, to groups of ships in specific geographical areas.
EGCs are transmitted over the **Inmarsat satellite** system (D). Specifically, the Inmarsat-C system provides the SafetyNET (for MSI) and RescueNET (for SAR) services which utilize Enhanced Group Calls to target vessels. Inmarsat offers reliable, global satellite coverage (excluding the extreme polar regions), making it ideal for broadcasting critical safety information far offshore.
COSPAS-SARSAT (A) is a satellite system dedicated to detecting distress alerts from EPIRBs, ELTs, and PLBs, not for broadcasting MSI. HF SITOR (NBDP) shore stations (B) and NAVTEX shore stations (C) are terrestrial systems primarily operating on HF or MF frequencies respectively. While both contribute to MSI dissemination, they are distinct from the satellite-based EGC service.
Related Questions
41F5 To receive all mandatory MSI using the SafetyNETTM system the vessel must:41F6 In using SafetyNETTM for the receipt of MSI (Maritime Safety Information):42F2 What is the purpose of the dedicated EGC receiver for A-1 area GMDSS Vessels?42F3 Which of the following provides a unique automated system capable of addressing messages to predetermined groups of ships or all vessels in both fixed and variable geographic areas?42F4 What system may be useful for messages, such as local storm warnings or a shore-to-ship Distress alert, for which it is inappropriate to alert all ships in the satellite coverage area?