The document describes Sichuan Network GPS services including: 1. A network of 13 reference stations spaced 42-132km apart connected to a central control center 2. The network provides RTK accuracy of ±2.5cm within a 4,500 sq km service area and RTD accuracy of ±33cm within a 36,000 sq km area 3. Evaluations found the network achieves better than specified accuracies with rapid attenuation beyond 50km from the network boundaries