Inmarsat Fleet

Inmarsat Fleet 77


Inmarsat Fleet 77 offers voice and the choice of mobile ISDN up to 64kbps for cost-effective, global communications, outside of the Polar Regions.


Fleet 77 also meets the distress and safety specifications of the Global Maritime Distress and Safety System (GMDSS) for voice communication. Through four-stage voice pre-emption and prioritization, the service supports the accreditation of ships’ systems and ensures high priority distress and safety needs are met.


Distress voice calls made on Fleet 77 are routed through a Land Earth Station (LES) to a Maritime Rescue Co-ordination Centre (MRCC).


COMSAT owns and operates teleports today under LES Access Code 001 for Fleet 77 services.



Inmarsat Fleet 33 and Fleet 55

Inmarsat is closing the F-33 and F-55 services at end-Q1, 2018. The planned date for closure is Wednesday, 11th April at 09:00 UTC. The service closures will be carried out as follows:


  1. At 08:55 UTC, NOC will verify that no F-55 or F-33 priority calls are in progress.
  2. At 09:00 UTC, NOC will start to bar F-33 and F-55 calls in the NCS for all LESs. This will take around 30 minutes to complete. Note that this will not stop any F-55 or F-33 calls that are in progress at the time.
  3. At the same time, ESAS file updates will be generated to remove the active F-55 and F-33 terminals from the network. These files will take several hours to be generated and distributed, however, the F-55 and F-33 traffic will stop once the NCS barring is complete at around 09:30 UTC.
  4. No specific action is required from LESOs at this stage - the ESAS files will be automatically processed by LESs as they are distributed.
  5. Once the NCS barring is completed, NOC will check that no new F-55 or F-33 calls are set up.
  6. Any F-55 or F-33 calls still in progress will be allowed to terminate normally. Please note that all F-55 and F-33 calls will be billed, even if they take place after the service has formally closed.

At a later date, ESAS housekeeping files will be generated to permanently remove all F-55 and F-33 terminals from the network. LESOs will be notified prior to the start of this activity.


A reminder of the F-55 and F-33 closure will be sent by email 48 hours prior to the start of the closure.



Inmarsat MPDS

This notification provides a final reminder of the imminent global closure of services, and the regional closure of the Mobile Packet Data Service (MPDS) in the Inmarsat-3 (I-3) Atlantic Ocean Region West (AORW).


MPDS will remain available globally until 31 March 2018, at which point we will commence the service closure in the AORW region. Following this, MPDS will continue to be supported on Fleet 77 (and Swift 64), in all other I-3 ocean regions, on reasonable effort basis, and will be closed in stages as shown in the EOL (End-of-Life) schedule below. No MPDS will be available beyond 2018.


The EOL date for the Fleet 77 service remains unchanged as 01 December 2020 as per our last communication in December 2017.

  • Atlantic Ocean Region West (AORW): 31 March 2018
  • Atlantic Ocean Region East (AORE): End Q2 2018
  • Pacific Ocean Region (POR): End Q3 2018
  • Indian Ocean Region (IOR): End Q4 2018

Contact Us
Call or contact COMSAT to learn more about our services.
+1.571.599.3600
Inmarsat Fleet Letter
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FINAL Fleet Closure Reminder
View FINAL Fleet Closure Reminder