Inmarsat was chartered as an intergovernmental group (IGO) in 1979 to exploit the emerging satellite engineering for cellular communications to improve maritime communications, specially to improve safety of life at sea. In view on the possible future benefits of offering positioning applications as well as communications providers for cellular users, the organization's official purposes incorporated the authority to provide radio determination services.

Inmarsat communications companies commenced in February 1982. At first Inmarsat fulfilled its mandate utilizing room resources leased from 3rd parties. Since 1990, Inmarsat has used satellites specified, procured, owned, and operated internally. Its primary and second generation satellite techniques provided maritime and later aeronautical and land mobile companies but didn't consist of radio location-determination capabilities.

Through the evolution in the SBAS concept, Inmarsat played an active part in satellite navigation. In November 1990, it made the decision to include navigation transponders on its third generation of geostationary satellites, Inmarsat-3, created to offer the space capability required by WAAS and EGNOS.

Inmarsat-3 satellites alone, nevertheless, don't give sufficiently redundant coverage for EGNOS and WAAS to offer operational services throughout their respective assistance places. Moreover, far more GEOs is going to be necessary to assure a correct replenishment policy when the Inmarsat-3 satellites terminate their operational life.

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

Five Inmarsat-3 satellites were effectively launched among 1996 and 1998, every carrying a dedicated navigation transponder. As described earlier, the Inmarsat-3 navigation transponders form an integral component of WAAS and EGNOS, which enhance availability, integrity and accuracy in the main 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 via COMSAT for WAAS and two leased for EGNOS.

On April 15, 1999, Inmarsat became the initial intergovernmental group to privatize, even though it even now maintains its essential public assistance responsibilities for maritime safety, even as a private company.

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