Inmarsat was chartered as an intergovernmental corporation (IGO) in 1979 to exploit the emerging satellite technology for cellular communications to improve maritime communications, specifically to enhance safety of life at sea. In view of the possible future advantages of delivering positioning applications in addition to communications services for mobile users, the organization's official purposes included the authority to supply radio determination providers.

Inmarsat communications services commenced in February 1982. At first Inmarsat fulfilled its mandate making use of space resources leased from 3rd parties. Since 1990, Inmarsat has used satellites specified, procured, owned, and operated internally. Its first and second generation satellite systems provided maritime and later aeronautical and land mobile services but didn't include things like radio location-determination capabilities.

Throughout the evolution on the SBAS concept, Inmarsat played an active role in satellite navigation. In November 1990, it decided to include navigation transponders on its third generation of geostationary satellites, Inmarsat-3, developed to produce the room capacity required by WAAS and EGNOS.

Inmarsat-3 satellites alone, however, do not give sufficiently redundant coverage for EGNOS and WAAS to offer operational providers throughout their respective service locations. Furthermore, much more GEOs is going to be necessary to assure a proper replenishment policy when the Inmarsat-3 satellites terminate their operational life.

Navigation Payloads. In 1989, Inmarsat cooperated using the European Space Agency (ESA) on its Navsat system studies, and this led for the advancement of specifications for navigation payloads for being embarked on geostationary satellites. Inmarsat then adopted these specifications for such payloads on Inmarsat-3 and developed these transponders for use as a civil complement and overlay for augmenting GPS and GLONASS.

Five Inmarsat-3 satellites were successfully launched concerning 1996 and 1998, each and every carrying a dedicated navigation transponder. As mentioned earlier, the Inmarsat-3 navigation transponders form an integral component of WAAS and EGNOS, which enhance availability, integrity and accuracy of the primary GPS and GLONASS navigation signals over North America and Europe. Inmarsat is currently the only operating supplier of navigation payloads for SBAS, with two transponders leased through COMSAT for WAAS and two leased for EGNOS.

On April 15, 1999, Inmarsat became the primary intergovernmental corporation to privatize, though it even now maintains its important public service responsibilities for maritime safety, even as a private organization.

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