A ground-control system is described that utilizes inexpensive ground stations to 1) maintain the two present Satcom satellites in geostationary orbit and on station in both latitude and longitude to within ±0 .1° , 2) to provide the same capabilities for one additional satellite, and 3) to assure uninterrupted 24-hour domestic communications capability. Reliability of the system through highly automated dual, but autonomous, control is discussed, as are the tracking, telemetry, and command (TT&C) stations and spacecraft operations control centers (SOCC's) located at two earth stations in New Jersey and California. In addition, details are presented as to system computers and associated software, antenna functions, and the accomplishment of the command, telemetry, and ranging functions.