Inmarsat Plc engages in the provision of global mobile satellite communications services. The company operates through five segments: Maritime, U.S. Government, Enterprise, Aviation, and Global Government. 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, business, and general aviation services. The U.S. Government segment focuses on U.S. and worldwide civil and military government services. The Global Government segment includes worldwide civil and military government services. The company was founded on July 16, 1979 and is headquartered in London, the United Kingdom.