Global Maritime Safety With Iridium GMDSS

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Optimized Vessel Communications

All Iridium Connected® GMDSS terminals come with a standard functionality for all three satellite GMDSS services: Distress Alert, Safety Voice, and Maritime Safety Information (MSI).

The Iridium network is designed to work in extreme conditions at sea, providing reliable coverage even in adverse weather around the entire globe, including over the Arctic and Antarctic waters in Sea Area A4.

All terminals provide global voice, data and broadband services over Iridium's global satellite network and the ability to utilize the complete range of Iridium's services.

The initial Iridium Connected GMDSS terminal developed by Lars Thrane (LT-3100S) is expected to supply all three satellite GMDSS services at a much lower cost than other equipment available in the market.

Features & Benefits

Sail with Confidence

Iridium’s all-in-one GMDSS service offers truly global coverage to mariners sailing any of the world’s oceans

Distress Alert

Activated by the press of a button, distress alerting sends basic, but critical data to a Rescue Coordination Center (RCC).

Safety Voice

Connect to an RCC and other maritime authorities through a phone call over the Iridium network to share additional details about the distress situation.

Maritime Safety Information (MSI)

Navigational, meteorological and safety-related information transmitted through an Enhanced Group Call (EGC) service called Iridium SafetyCast.

Ship Security Alert System (SSAS)

A safety measure used for ship security, particularly in relation to acts of piracy and terrorism, SSAS is a silent ship security alarm system which, when activated, will send an alert to the ship's owner or an SSAS management third party.

Long Range Identification And Tracking (LRIT)

Facilitates the global identification and tracking of ships by transmitting their identity, position and report date and time every six hours.

Extensive Features

Distress alert relay, shore-to-ship distress calling, maritime assistance and standard maritime calling and messaging.


As a strategic partner for Iridium GMDSS, Speedcast has trained engineers ready for deployment and can manage deployment from design, integration and installation of shipboard networks

Value-added Services

As a Speedcast customer, you’ll have access to our broad range of value-added services including people and asset tracking, crew welfare, IoT solutions, SpeedMail+ and direct connection with cloud service providers.

Technical Information

Innovative designs delivering unmatched speed, coverage and reliability of mobile safety services at sea.

LT-3100S GMDSS System

LT-3100S GMDSS System

Lars Trane’s LT-3100S GMDSS system is designed for all IMO vessels. It meets all standards and certification requirements needed for worldwide maritime satellite communications equipment (MED, Wheelmark).

LT-3110S Control Unit

  • Weight: 658 g (1.45 lbs)
  • Dimensions: 224.0 x 120.0 x 70.0 mm (8.82 x 4.72 x 2.76 in)
  • Temperature, operational: -15°C to +55°C (+5°F to +131°F)
  • IP rating, dust and water: IP32


LT-3120 Handset Unit

  • Weight: 290 g (0.64 lbs)
  • Dimensions: 208.8 x 52.8 x 38.2 mm (8.22 x 2.08 x 1.50 in)
  • Temperature, operational: -15°C to +55°C (+5°F to +131°F)
  • IP rating, dust and water: IP32


LT-3130 Antenna Unit

  • Weight: 687 g (1.51 lbs)
  • Dimensions: 151.1 x Ø 149.5 mm (5.95 x Ø 5.89 in)
  • Temperature, operational: -40°C to +55°C (-40°F to +131°F)
  • IP rating, dust and water: IP67



In the box

  • LT-3110S Control Unit
  • LT-3120 Handset
  • LT-3121 Cradle
  • LT-3130 Antenna Unit
  • Bracket Mount, Control Unit
  • Power Cable, 3m
  • Stainless steel A4 screws for mounting
  • User & Installation Manual
  • Unit Test Sheets

Downloads & Resources

Iridium GMDSS Brochure

Read about the features and functionality of Iridium GMDSS


GMDSS Whitepaper

Read about the three keys to next generation maritime safety

Learn More

LT-3100S Data Sheet

Read about the features and functionality of Lars Trane's LT-3100S


Iridium Certus Firmware

Download the most up-to-date Iridium Certus firmware and software for your products.

Learn More

Comprehensive Connectivity and Innovation Solutions

Our solution expertise spans more industries and locations than any other provider. Learn more about how Speedcast delivers fully-connected systems and future-ready solutions designed to accelerate your mission and amplify your operations, anywhere in the world.

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