LT-3100S Iridium GMDSS

In 2018, the IMO’s Maritime Safety Committee recognised Iridium as a Recognised Mobile Satellite Service (RMSS) for GMDSS — an alternative to Inmarsat C, and the first truly pole-to-pole option for maritime distress and safety. The LT-3100S is the system that made it real: developed and manufactured by Lars Thrane, it remains the first and only Iridium GMDSS terminal available, meeting every standard and certification required of GMDSS communications equipment, including MED and Wheelmark approval.

The LT-3100S delivers Distress Alert, Safety Voice, and Maritime Safety Information (MSI), alongside the Ship Security Alert System (SSAS) and Long Range Identification & Tracking (LRIT). With 100% global coveragethrough the Iridium® network, distress and safety communication is assured across Sea Areas A1, A2, and A3 — anywhere on the world’s oceans, including the poles.

Built on the proven LT-3100 platform, the system pairs a control unit, handset, and antenna unit, linked by a single coaxial cable allowing up to 500 metres of separation — so the antenna goes wherever it has the clearest view of the sky. Beyond safety, it serves as a capable primary communications system, offering voice, SMS, data, and vessel tracking at competitive Iridium airtime rates.

Built for the harsh reality of life at sea, the LT-3100S operates reliably from –40°C to +55°C. Installation is simple, with everything included in the box: mount the control unit on a bracket or flush mount, and the antenna on a 1.5″ or 2.0″ pole. The large 4.3″ TFT display gives clear day-and-night operation, while the built-in webserver makes service and configuration straightforward. More than 40 years of engineering experience are built into every unit.