SGSI is a one-stop shop for leasing services, providing space segment, terrestrial connectivity, equipment, network management, service, support, and billing. SGSI provides Inmarsat B, Inmarsat GAN, BEST (Bandwidth Efficient Satellite Transport) and ELS (Enhanced Leasing Services). Our Customer Care provides the best support in the industry. Technical support staff are available 24/7 to immediately address all terminal and service issues.