Question 1-24D2

Maritime Safety Information (MSI) encompasses navigational warnings, meteorological warnings, and other urgent safety-related messages critical for vessels. The Global Maritime Distress and Safety System (GMDSS) outlines various methods for ships to receive this vital information. **NAVTEX (Navigational Telex)** is an international automated direct-printing service primarily operating on MF (e.g., 518 kHz). It is a key method for delivering MSI to ships in coastal and near-shore areas (GMDSS sea areas A1/A2). **SafetyNET** is a global satellite-based service, part of the Inmarsat system (specifically via Inmarsat-C terminals). It delivers MSI to vessels in ocean regions (GMDSS sea areas A3/A4) where terrestrial NAVTEX coverage is unavailable. **HF NBDP (High Frequency Narrow-Band Direct-Printing)** allows for the transmission of text messages over long distances via HF radio. Within GMDSS, specific HF NBDP frequencies are designated for meteorological services and Search and Rescue coordinators to broadcast MSI, especially in GMDSS sea areas A3/A4, serving as a supplementary or alternative method to SafetyNET. Therefore, all three methods are recognized and utilized for obtaining MSI under the GMDSS framework.