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Inmarsat was chartered as an intergovernmental institution (IGO) in 1979 to exploit the emerging satellite technologies for mobile communications to enhance maritime communications, specially to enhance safety of life at sea. In view in the potential future advantages of supplying positioning applications together with communications products and services for cellular users, the organization's official purposes included the authority to supply radio determination providers.

Inmarsat communications products and services commenced in February 1982. Initially Inmarsat fulfilled its mandate utilizing space resources leased from third parties. Since 1990, Inmarsat has applied satellites specified, procured, owned, and operated internally. Its primary and second generation satellite systems provided maritime and later aeronautical and land mobile products and services but did not contain radio location-determination capabilities.

All through the evolution with the SBAS idea, Inmarsat played an active part in satellite navigation. In November 1990, it decided to include navigation transponders on its third generation of geostationary satellites, Inmarsat-3, created to provide the room capacity needed by WAAS and EGNOS.

Inmarsat-3 satellites alone, even so, don't give sufficiently redundant coverage for EGNOS and WAAS to offer operational providers throughout their respective assistance areas. Furthermore, a lot more GEOs will probably be needed to assure a correct 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 program studies, and this led to the improvement of specifications for navigation payloads being embarked on geostationary satellites. Inmarsat then adopted these specs for such payloads on Inmarsat-3 and created these transponders for use as a civil complement and overlay for augmenting GPS and GLONASS.

Five Inmarsat-3 satellites were effectively launched between 1996 and 1998, every carrying a dedicated navigation transponder. As pointed out earlier, the Inmarsat-3 navigation transponders form an integral part of WAAS and EGNOS, which boost availability, integrity and accuracy in 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 via COMSAT for WAAS and two leased for EGNOS.

On April 15, 1999, Inmarsat became the first intergovernmental institution to privatize, although it nevertheless maintains its significant public assistance responsibilities for maritime safety, even as a private organization.

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