This Digital Radio Gets Messages to the World’s Remotest Locations

Rhizomatica, a Philadelphia-based nonprofit, has introduced the High-frequency Emergency and Rural Multimedia Exchange System (HERMES), an open-source digital shortwave radio set designed to provide connectivity in remote, off-grid areas. Operating in the 3 to 30 megahertz high-frequency band, HERMES functions as a data pipeline, allowing users to transmit files such as emails, photos, and GPS coordinates over long distances using the ionosphere. Unlike traditional voice-only radios, HERMES enables more efficient communication for emergency services, telemedicine, and logistics in regions where terrestrial infrastructure is impractical. The system also features optional encryption to protect sensitive data for users in vulnerable environments. A recent pilot project in Bangladesh demonstrated the system's efficacy when fishers used it to coordinate a rescue after experiencing mechanical failure in the Bay of Bengal. By leveraging low-power hardware, HERMES provides a vital communication lifeline for isolated communities globally.