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Inmarsat was chartered as an intergovernmental organization (IGO) in 1979 to exploit the emerging satellite technology for cellular communications to improve maritime communications, specially to boost safety of existence at sea. In view of the potential future benefits of providing positioning applications in addition to communications providers for cellular users, the organization's official purposes integrated the authority to supply radio determination companies.

Inmarsat communications services commenced in February 1982. Initially Inmarsat fulfilled its mandate using space resources leased from 3rd parties. Since 1990, Inmarsat has used satellites specified, procured, owned, and operated internally. Its primary and second generation satellite methods provided maritime and later aeronautical and land cellular services but did not include radio location-determination capabilities.

Throughout the evolution with the SBAS concept, Inmarsat played an active part in satellite navigation. In November 1990, it made a decision to include navigation transponders on its 3rd generation of geostationary satellites, Inmarsat-3, developed to supply the space capacity required by WAAS and EGNOS.

Inmarsat-3 satellites alone, nevertheless, don't give sufficiently redundant coverage for EGNOS and WAAS to provide operational providers all through their respective service areas. Moreover, more GEOs will probably be necessary to assure a correct replenishment policy when the Inmarsat-3 satellites terminate their operational existence.

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

Five Inmarsat-3 satellites had been successfully launched in between 1996 and 1998, each 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 in the principal GPS and GLONASS navigation signals over North America and Europe. Inmarsat is presently 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 very first intergovernmental organization to privatize, though it nevertheless maintains its essential public assistance responsibilities for maritime security, even as a private firm.

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