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Inmarsat was chartered as an intergovernmental group (IGO) in 1979 to exploit the emerging satellite technologies for cellular communications to enhance maritime communications, especially to enhance security of existence at sea. In view with the possible future benefits of offering positioning applications in addition to communications companies for mobile users, the organization's official purposes incorporated the authority to present radio determination products and services.

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

All through the evolution on the SBAS idea, Inmarsat played an active role in satellite navigation. In November 1990, it made the decision to contain navigation transponders on its 3rd generation of geostationary satellites, Inmarsat-3, created to produce the space capability required by WAAS and EGNOS.

Inmarsat-3 satellites alone, on the other hand, do not give sufficiently redundant coverage for EGNOS and WAAS to offer operational companies through their respective support locations. Moreover, far more GEOs will probably be essential 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 Room Agency (ESA) on its Navsat program studies, and this led for the improvement of specs for navigation payloads for being embarked on geostationary satellites. Inmarsat then adopted these specs for such payloads on Inmarsat-3 and developed these transponders for use as a civil complement and overlay for augmenting GPS and GLONASS.

5 Inmarsat-3 satellites have been effectively launched concerning 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 improve availability, integrity and accuracy with the major GPS and GLONASS navigation signals above North America and Europe. Inmarsat is presently 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 primary intergovernmental group to privatize, although it nevertheless maintains its critical public support responsibilities for maritime safety, even like a private corporation.

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