Inmarsat was chartered as an intergovernmental institution (IGO) in 1979 to exploit the emerging satellite technology for mobile communications to improve maritime communications, particularly to improve security of life at sea. In view on the possible future advantages of delivering positioning applications along with communications services for mobile users, the organization's official purposes incorporated the authority to present radio determination providers.
Inmarsat communications companies commenced in February 1982. At first Inmarsat fulfilled its mandate utilizing space resources leased from third parties. Since 1990, Inmarsat has used satellites specified, procured, owned, and operated internally. Its very first and second generation satellite techniques offered maritime and later aeronautical and land mobile companies but didn't contain radio location-determination capabilities.
Throughout the evolution of the SBAS concept, Inmarsat played an active role in satellite navigation. In November 1990, it made the decision to contain navigation transponders on its third generation of geostationary satellites, Inmarsat-3, created to present the room capacity needed by WAAS and EGNOS.
Inmarsat-3 satellites alone, however, do not give sufficiently redundant coverage for EGNOS and WAAS to offer operational companies throughout their respective support locations. Furthermore, much more GEOs will be necessary to assure a proper replenishment policy when the Inmarsat-3 satellites terminate their operational life.
Navigation Payloads. In 1989, Inmarsat cooperated while using the European Space Agency (ESA) on its Navsat program studies, and this led for the improvement of specifications 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 involving 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 enhance availability, integrity and accuracy from the main GPS and GLONASS navigation signals above 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 1st intergovernmental institution to privatize, though it still maintains its important public service responsibilities for maritime safety, even being a private organization.
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