The Yacht Technology Blog

Are you ready for the Inmarsat B and Mini-M EOL switch off?

Posted by Darren Mayhead on Nov 22, 2016 11:14:55 PM


sat_antennas.jpgBack in 2014, Inmarsat notified its customers that its legacy services Inmarsat M, Inmarsat D+, Inmarsat B, GAN and Mini-M would be phased out at the end of 2016, and replaced with faster and more efficient products. Chances are, your satellite services provider has already replaced the equipment reaching its end of life (EOL) date, but if you still haven’t upgraded to the newer equipment, now is the time to make the change.

On December 30, 2016, terminals associated with the retired services will be deactivated on the network, and all existing customers should migrate to the recommended replacement services. The new replacement services offer superior quality, higher speeds, and cost effective and flexible fees, all accessed through smaller and lighter terminals.  

What Replacement Product Should You Choose for Your Legacy Inmarsat Equipment?

Inmarsat Fleet77 and Inmarsat B are the only ones that are GMDSS. The other ones are not, and therefore, they can be replaced with any service and terminal equipment that meets the end user’s need. Inmarsat C is still available and is a GMDSS system. Smaller and much cheaper, if a vessel needs GMDSS only then Inmarsat C can replace retiring legacy services.

Inmarsat Maritime M, Maritime Mini-M, and Maritime B terminals can be replaced by the new Inmarsat FleetBroadband service which offers multiple voice lines, texting, and broadband internet access with three different terminal configurations.


The FleetBroadband terminals have two clear advantages over their predecessors. One, the footprint is extremely compact, requiring little or no additional fabrication to replace the old terminals. Second, the rain fade on FleetBroadband terminals is so powerful it far outpaces competitive products, maintaining connectivity even in bad weather.

However, depending on the services your vessel actually uses and needs, FleetBroadband can be a very expensive service and several FleetBroadband customers have moved to VSAT (Ku) simply because it is cheaper and still provides unlimited data.

While it is true the up-front hardware is more expensive, in the long run the lower ongoing service fees of VSAT make up a greater cost benefit to the vessel.

Great Circle Systems provides guidance and service to keep you connected no matter where your vessel is sailing. Contact a GCS engineer today to discuss your options!

Talk to a Member of our Team

Terminal / Service Type

Recommended Replacement Service

Maritime M

FleetBroadband or XpressLink

Maritime Mini – M

FleetBroadband or VSAT

Maritime B

FleetBroadband or XpressLink

Topics: vessel internet, marine vsat, marine voip, yacht email, broadband internet access, EOL for Inmarsat B, M and Mini-M

JD_Crawford_head_shotDarren and the GCS team have been instrumental in the development and deployment of several carrier grade IT networks for large scale, Savant-based super-yacht projects where the technology infrastructure needed to be extremely reliable. 


The capabilities of the GCS team have proven instrumental in helping us deliver a world class technology experience to some of the most prestigious yachts in the world.


J.D. Crawford of Savant Systems


I have been working with Great Circle Systems since 2006 when they did the installation of all our networking and Internet communications equipment on our boat being built in Germany.


The equipment they recommended and installed was exactly as we required.  We have had extremely good results with all of their equipment and it has performed as they had advised.


I would highly recommend them to all fellow captains.


Captain Keith T. Moore of M/Y Lady Sheridan

CE_W_Michael_Hummel_of_MY_TVTriton Administrator has proven to be the perfect tool for us on M/Y TV, which is a 78 meter Luerssen yacht.


Triton has comprehensive essential features plus any additional features one can possibly need. It is still easy to use and has a swift support team to implement customer-specific wishes, such as individual day logs, etc.


W. Michael Hummel, Chief Engineer of M/Y TV


Captain Bruno Herregods talks about Great Circle Systems tech support. 

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