Lars Thrane LT-3100S basic Iridium Satellite GMDSS System


Lars Thrane LT-3100S GMDSS Terminal

  • Service plans as low as $5/month
  • Simpler alternative to DSC Single-Side Band radio for ocean crossing boats needing emergency communications, without the high cost of satellite airtime plans.
  • Get Iridium’s 100% Global coverage along with low cost service for emergency/distress.
  • Leisure boaters get safety and security of reliable, global GMDSS distress services
  • Receive maritime navigational, safety, and weather alerts automatically
  • Send and receive SMS messages to anyone
  • Make and receive satellite phone calls anytime you need
  • Access Satellite Email and Weather services (ie: Predictwind) via Iridium narrowband data
  • Activate the DISTRESS function for instant connection to search and rescue authorities from anywhere in the world.
  • Commercial ships comply with SOLAS/GMDSS Requirements for Sea Areas A1, A2, and A3.
  • Simple Install with compact antenna and integrated screen and handset, no smartphone required
  • Can be integrated with an onboard network and/or PBX system to access data and voice services from elsewhere on the vessel, including ability to place satellite phone calls from a smartphone app over WiFi (3rd party wifi router required)

Lars Thrane LT-3100/4100 Antenna 2in Pipe Mount

Lars Thrane A/S LT-3100/4100 Antenna 2in Pipe/Pole Mount

Lars Thrane LT-3100/4100/4200 Flush Mount

Lars Thrane A/S LT-3100/4100 Flush Mount


The LT-3100S GMDSS Terminal from Lars Thrane A/S is the first GMDSS solution to be available for Iridium’s 100% global coverage GMDSS service.  It provides, not only, the key services for GMDSS compliance – such as Distress Alert and Maritime Safety Information (MSI) – but also incorporates non-GMDSS features – non-priority voice, data and SMS – in one small form factor.

The LT-3100S GMDSS terminal is designed to exceed the requirements of the GMDSS and is an alternative to the Inmarsat C/mini-C terminals and combines voice and data capabilities with 100% global coverage. The LT-3100S GMDSS terminal consists of a control unit, handset, and an antenna unit. A single cable solution connects the control unit with the antenna unit – with cable runs up to 500 meters possible.

The LT-3100S GMDSS terminal is not only designed for GMDSS services, it also offers SSAS (via additional equipment) and LRIT functionalities. It can be used as the primary satellite communication product on vessels, covering the basic communication needs in terms of connectivity between the ship and shore, and vice versa via voice, SMS and data.  With competitive airtime rates, it’s the perfect satellite communication product onboard any vessel.

Key Features:

  • 100% Global GMDSS Coverage (Sea Areas A1 to A4)
  • Distress Alert & Safety Voice
  • Maritime Safety Information (MSI)
  • Long Range Identification and Tracking (LRIT)
  • Ship Security Alert System (SSAS), via additional equipment
  • Single antenna cable solution (up to 500 m)
  • Voice, SMS, SBD, and Modem Data (non-priority)
  • Large 4.3″ TFT display on Control Unit
  • Operational temperature range from -40⁰C to +55⁰C (-40⁰F to +131⁰F)

Support for:

  • External Alarm Panels
  • GMDSS Printer
  • Bridge Alert Management (BAM)


The LT-3100S GMDSS terminal is very easy to install; the control unit can be installed using either a bracket mount (included) or flush mount (option), and the antenna unit can be mounted using either a pole mount (1.5″ tube) or angle bracket mount (1″ to 2.5″ tube).

Additional information

Weight 15 lbs
Dimensions 30 × 30 × 15 in


Iridium GMDSS Airtime Plans