Sunnyvale, Calif.-based Trimble [Nasdaq: TRMB] is supplying Global Positioning System reference stations and virtual reference station (VRS) software to the Seismological Bureau of Sichuan Province in China to establish a VRS network around the city of Chengdu. The multi-purpose network provides high-precision GPS data for monitoring the Earth’s crustal movement and for surveying and construction work; the network will also provide correction data for real-time kinematic GPS users in the future.