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The NAVTEX (Navigational Telex) system provides automated maritime safety information (MSI) via medium-frequency radio broadcasts, operating as a passive receiver within the Global Maritime Distress and Safety System (GMDSS).0:36 While mandatory for SOLAS-regulated vessels over 300 gross tonnage, it remains an optional but valuable safety tool for recreational sailors, particularly for offshore passages outside of VHF or cellular coverage.2:59 The system receives weather bulletins, gale warnings, and search-and-rescue (SAR) alerts on 518 kHz (English) and 490 kHz (national languages), with a nominal range of 200 to 400 nautical miles.0:55

The NASA Marine BT-3 unit integrates with a smartphone via Bluetooth, allowing users to filter specific message types and stations through a mobile app.3:34 Installation involves connecting the unit to a 12V power source and mounting the H-Vector antenna on the stern pulpit.10:09 Because the system is passive, it requires no subscription or operator certification.1:49 The device stores incoming messages locally, replacing legacy thermal paper printers with digital display interfaces.4:00

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