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Enjoy summer with 40% off Anker Ka-band with AST


AST OPTIMA package

The all-inclusive 12 or 36-month fixed fee Iridium Certus® package for maritime


Iridium Certus® Cashback Promotion

Promotional credit for swap out of Iridium or selected hardware


Iridium GMDSS

The Iridium GMDSS service brings reliable, truly global GMDSS services to the market for the first time, giving the maritime industry real choice and making critical safety services available anywhere on the globe

Leading the way is the Lars Thrane LT-3100S GMDSS terminal, a truly versatile safety system that not only provides all the required GMDSS Distress Alerting and voice support but also offers non-safety features in one package.

  • Reliable coverage where no other option exists, including Polar Regions and Sea Area A4
  • Distress Alerting available at the press of just one button
  • Safety Voice - Connect to an RCC and maritime authorities
  • Truly global GMDSS service
  • ​Maritime Safety Information (MSI) - access navigational, meteorological and safety-related updates

Why Iridium GMDSS?

The Iridium GMDSS service enhances safety at sea for mariners, offering reliable coverage in sea areas where no other option exists. 

LT-3100S Iridium GMDSS Terminal

The LT-3100S GMDSS Terminal from Lars Thrane A/S is the first GMDSS solution to be available for the Iridium 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 terminal.

LT-3100S Iridium GMDSS Terminal

Iridium GMDSS Distress Alerting

Activated by the press of a button, distress alerting sends critical data to the Rescue Coordination Centre (RCC)

  • ID
  • Status
  • Position

Once a distress alert is confirmed, the highest priority voice call is automatically made directly to the RCC.

Iridium GMDSS Distress Alerting

Iridium GMDSS Safety Voice

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

  • High priority calling
  • Hydrographic reporting (navigational dangers)
  • Medical advice and assistance
Iridium GMDSS Safety Voice

Maritime Safety Information

Maritime Safety Information (MSI) is transmitted through and Enhanced Group Call (EGC) service called Iridium SafetyCastSM.

  • Navigational
  • Meteorological
  • Safety-related
Maritime Safety Information

Added Value

Additional features and benefits of the LT-3100S terminal and the Iridium GMDSS service:

  • Distress alert relay
  • Shore-to-ship distress calling
  • Maritime assistance
  • Standard maritime calling and messaging
Added Value

Iridium GMDSS: Establishing a New Standard for Safety at Sea

AST is an official launch partner of the Iridium GMDSS service.

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AST's global expertise in maritime communications enables the delivery of full maritime connectivity solution for your boat, ship or vessel. 

"With Iridium GMDSS, mariners will be able to sail with confidence" - Iridium

More choice. More value. Only from AST.

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