Lars Thrane LT-3100S GMDSS System

The Lars Thrane LT-3100S GMDSS System is the inaugural satellite solution for Iridium GMDSS Distress and Safety communications. Recognized by the IMO and the SOLAS convention, Iridium GMDSS is more than an alternative to Inm-C, offering truly global coverage and built-in Safety Voice.

Download Iridium GMDSS Fact Sheet



  • 100% Global GMDSS Coverage (Sea Areas A1 to A4)
  • Distress Alert & Safety Voice
  • Maritime Safety Information (MSI)
  • General Message Communication
  • Ship Security Alert System (SSAS)
  • Support for External Alarm Panels
  • Support for GMDSS Printer
  • Support for Bridge Alert Management (BAM)
  • Long Range Identification and Tracking (LRIT)
  • Voice, SMS, SBD, and Modem Data (Non-priority)
  • Single Antenna Cable Solution (Up to 500 m)
  • High-performance GNSS/GPS Receiver
  • Webserver for Configuration and Maintenanc

The LT-3100S GMDSS System is fulfilling the new MED directive with Wheel Mark approval. Small and compact. No requirements for either message terminal or printer.

The solution offers GMDSS services as well as Voice, SMS, and Data. The built-in GNSS/GPS receiver supports features like tracking. Interface for BAM and ECDIS. The Antenna Unit can be installed up to 500 meters from the Control Unit.

The standard LT-3100S GMDSS terminal is offered in a version that includes control unit & bracket mount, handset & cradle, antenna unit & power cable. The standard version fulfills all the GMDSS basic requirements. Additional services like SSAS, GMDSS Alarm Panels and printer, will require the LT-3140S Interface Unit.

Technical Specifications

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: IP