On 9th May 2018 at 14:00 UTC, Inmarsat plan to take the first step in migrating its Inmarsat C services from its I-3 to I-4 satellites when AORW (I-3) moves to AMER (I-4). While impact is expected to be minimal, Inmarsat advise the following:

„This migration step will cause a short outage while services are moved onto the I-4 satellites. Under supervision of the International Mobile Satellite Organisation (IMSO), the Global Maritime Distress Safety System (GMDSS) and Maritime Safety Services will be closely monitored during the migration, as will the Classic Aero Safety Service. These safety services will be restored first with the highest priority.“

We advise our customers to avoid scheduling SSAS or LRIT Conformance tests between 8th – 10th May 2018, in case there is any unexpected impact on the system as a result of this change.

If you are an Inmarsat C customer you have probably already been directly notified by your Inmarsat C Service Provider regarding this change; however you can find further details on the Inmarsat website, or contact your Inmarsat C Service Provider if you are unsure of what action you may be required to take.

Inmarsat I-3 to I-4 services migration