LT3100S IRIDIUM GMDSS satcom system
LT 90-102071
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Key Features:

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 maintenance


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


In 2018, the IMO’s Maritime Safety Committee (MSC) recognized Iridium as a provider of GMDSS satellite services. In early 2020, these GMDSS services, hereunder: Distress Alert, Safety Voice, and Maritime Safety Information (MSI) will be available via the LT-3100S GMDSS system, a terminal developed by Lars Thrane A/S.

The LT-3100S GMDSS system is designed for all IMO vessels and will be an alternative to the Inmarsat C. The LT-3100S GMDSS system meets all standards and certification requirements needed for worldwide maritime satellite communications equipment (MED, Wheelmark).


The LT-3100S GMDSS system has voice and data capabilities with 100% global coverage. The LT-3100S GMDSS system consists of a control unit, handset, and antenna unit. A single cable solution connects the control unit with the antenna unit. Using a standard coaxial cable, up to 500 meters of separation between the units can be obtained, giving freedom to mount the antenna in the best possible location, with free line of sight to the satellites.

The LT-3100S GMDSS system is not only designed for GMDSS services. It also offers SSAS 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. The LT-3100S GMDSS system also provides voice, SMS, data, vessel tracking, and other Iridium services with competitive airtime rates, making it the perfect satellite communication product on board any vessel.

The LT-3100S GMDSS System is designed and built for the demanding and rough environment at sea and with an operational temperature range from -40⁰C to +55⁰C (-40⁰F to +131⁰F).


The LT-3100S GMDSS system is very easy to install. Everything is included in the box to get started with the installation and operating the LT-3100S GMDSS system. The control unit can be installed using either a bracket mount or flush mount. The antenna unit can be mounted using either a pole mount (1.5″ tube) or angle bracket mount (1″ to 2.5″ tube). The control unit has a large 4.3″ TFT display, from where the system can be operated with overview and ease. The built-in webserver can be used for service and maintenance.

More than 40 years of experience have been put into the design and construction of the LT-3100S GMDSS system, with an exceptional performance and specification level.

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