Inmarsat was chartered as an intergovernmental group (IGO) in 1979 to exploit the emerging satellite technologies for mobile communications to improve maritime communications, specifically to improve security of life at sea. In view on the potential future benefits of supplying positioning applications along with communications services for mobile users, the organization's official purposes integrated the authority to produce radio determination providers.

Inmarsat communications companies commenced in February 1982. Initially Inmarsat fulfilled its mandate using room resources leased from third parties. Since 1990, Inmarsat has used satellites specified, procured, owned, and operated internally. Its first and second generation satellite techniques offered maritime and later aeronautical and land mobile companies but did not consist of radio location-determination capabilities.

All through the evolution of the SBAS concept, Inmarsat played an active role in satellite navigation. In November 1990, it made a decision to include things like navigation transponders on its third generation of geostationary satellites, Inmarsat-3, created to supply the space capability needed by WAAS and EGNOS.

Inmarsat-3 satellites alone, however, do not give sufficiently redundant coverage for EGNOS and WAAS to provide operational products and services throughout their respective support areas. Moreover, a lot more GEOs will be necessary to assure a proper replenishment policy when the Inmarsat-3 satellites terminate their operational existence.

Navigation Payloads. In 1989, Inmarsat cooperated with all the European Space Agency (ESA) on its Navsat program studies, and this led to the development of specs for navigation payloads to be embarked on geostationary satellites. Inmarsat then adopted these specifications for such payloads on Inmarsat-3 and developed these transponders for use like a civil complement and overlay for augmenting GPS and GLONASS.

5 Inmarsat-3 satellites were effectively launched in between 1996 and 1998, each carrying a dedicated navigation transponder. As described earlier, the Inmarsat-3 navigation transponders form an integral part of WAAS and EGNOS, which enhance availability, integrity and accuracy of the main GPS and GLONASS navigation signals around North America and Europe. Inmarsat is currently the only operating supplier of navigation payloads for SBAS, with two transponders leased via COMSAT for WAAS and two leased for EGNOS.

On April 15, 1999, Inmarsat became the very first intergovernmental group to privatize, although it still maintains its important public service responsibilities for maritime security, even being a private organization.

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