Inmarsat was chartered as an intergovernmental organization (IGO) in 1979 to exploit the emerging satellite engineering for mobile communications to improve maritime communications, especially to boost safety of existence at sea. In view from the possible future benefits of offering positioning applications together with communications services for mobile users, the organization's official purposes involved the authority to provide radio determination products and services.

Inmarsat communications providers commenced in February 1982. At first Inmarsat fulfilled its mandate using room resources leased from third parties. Since 1990, Inmarsat has used satellites specified, procured, owned, and operated internally. Its initial and second generation satellite methods provided maritime and later aeronautical and land cellular providers but didn't include radio location-determination capabilities.

Through the evolution from the SBAS concept, Inmarsat played an active role in satellite navigation. In November 1990, it determined to include navigation transponders on its 3rd generation of geostationary satellites, Inmarsat-3, developed to offer 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 services through their respective service places. Moreover, far 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 the European Room Agency (ESA) on its Navsat system studies, and this led towards the development of specs for navigation payloads to become embarked on geostationary satellites. Inmarsat then adopted these specifications for such payloads on Inmarsat-3 and developed these transponders for use being a civil complement and overlay for augmenting GPS and GLONASS.

Five Inmarsat-3 satellites have been successfully launched among 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 with the key 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 initial intergovernmental organization to privatize, even though it still maintains its important public support responsibilities for maritime security, even as a private corporation.

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