Question 2A6

Maritime Safety Information (MSI) includes urgent navigational warnings, meteorological warnings and forecasts, and other distress alerts. **NAVTEX** is an international automated direct-printing service for promulgation of MSI to ships. It operates on specific medium and high frequencies (e.g., 518 kHz for international broadcasts) and is a mandatory component of the Global Maritime Distress and Safety System (GMDSS) for receiving such information. Therefore, a NAVTEX receiver is specifically designed to receive MSI. * **SART (Search and Rescue Transponder)** is a device that transmits a signal when interrogated by radar, aiding rescuers in locating a vessel or survival craft in distress. It transmits, it does not receive MSI. * **EPIRB (Emergency Position-Indicating Radio Beacon)** is a distress beacon that transmits a signal via satellite to alert search and rescue authorities and provide position data. It transmits distress alerts, it does not receive MSI. * **Inmarsat-B** is a satellite communication system that provides voice, fax, telex, and data services. While Inmarsat systems (specifically SafetyNET via Inmarsat-C or FleetBroadband) are used to *deliver* MSI, Inmarsat-B itself is a general communication terminal, not the dedicated, primary receiver for MSI in the same direct way NAVTEX is. For direct reception of MSI as described in GMDSS, NAVTEX is the definitive answer among the choices.