The Global Positioning System IIF is a current iteration of the GPS satellite, which Boeing began building in 1978. The company has constructed more than 40 GPS satellites that cumulatively have provided more than 525 years of on-orbit service. GPS satellites orbit some 12,000 miles above the Earth and comprise a worldwide timing and navigation system. GPS IIF Quick Facts An on-orbit, reprogrammable processor receives software uploads for improved system operation. Innovative pulse-line manufacturing approach delivered IIF fleet of 12 to meet constellation sustainment schedule. Twelve-year design life provides long-term service and reduced operating costs. New L5 signal for safety-of-life transportation applications. GPS IIF satellites have increased signal power for civil applications. Technical Specifications Position Accuracy Requirement 3-meter (on orbit performance exceeding next generation specification) Mass at Launch 3,600 lbs (1,633 kg) Power 1952 W, end of life Solar Cells High efficiency Gallium Arsenide Dimensions 99 in by 81 in by 71 in (251 cm by 206 cm by 180 cm) New L5 Signal 1176.45 MHz Autonomous Operations Up to 60 days