Inmarsat plc provides mobile satellite communications services on land, at sea, and in the air worldwide. The company operates through five segments: Maritime, US Government, Enterprise, Aviation, and Global Government. It offers voice and data broadband services; global maritime distress and safety system services; mobile and fixed voice services; a portfolio of machine-to-machine services that provide two-way data connectivity for messaging, tracking, and monitoring of fixed or mobile assets; maritime satellite services, including very small aperture terminals and television receive only antenna services; and Global Xpress, a high-speed broadband service that offer seamless connectivity for advanced data services on land, at sea, and in the air. The company also offers in-flight voice, data, safety, and cabin connectivity services for business and commercial air transport. It connects to its fleet of 13 satellites using a range of equipment, including global handheld satellite phones and notebook-size broadband Internet devices, as well as specialist terminals and antennas fitted to ships, aircraft, and road vehicles. It serves governments, airlines, the broadcast media industry, the oil and gas industry, the mining and construction industry, and humanitarian aid agencies. The company was founded in 1979 and is headquartered in London, the United Kingdom.