Inmarsat Plc engages in the provision of global mobile satellite communications services. The company operates through five segments: Maritime, Government, Enterprise, Aviation, and Central Services. The Maritime segment focuses on worldwide commercial maritime services. The Enterprise segment includes worldwide energy, industry, media, carriers, and machine-to-machine services. The Aviation segment provides commercial aviation services. The Government segment focuses on U.S. and worldwide civil and military government services. The Central services segment includes satellite operations and backbone infrastructure. The company was founded on July 16, 1979 and is headquartered in London, the United Kingdom.