Inmarsat was the world's first global mobile satellite
communications operator and is still the only one to
offer a mature range of modern communications services
to maritime, land-mobile, aeronautical and other users.
Inmarsat Ltd is a subsidiary of the Inmarsat Ventures
plc holding company. It operates a constellation of
geostationary satellites designed to extend phone, fax
and data communications all over the world. The
constellation comprises five third-generation satellites
backed up by four earlier spacecraft.
The satellites are controlled from Inmarsat's
headquarters in London. Inmarsat has regional offices in
Dubai, Singapore and India.
Today's Inmarsat system is used by independent service
providers to offer a range of voice and multimedia
communications. Users include ship owners and managers,
journalists and broadcasters, health and disaster-relief
workers, land transport fleet operators, airlines,
airline passengers and air traffic controllers,
government workers, national emergency and civil defence
agencies, and peacekeeping forces.