Leica Geosystems Inc. has upgraded and expanded the coverage of its Leica SmartNet RTK Network in California, making real-time GNSS correction available to 82 percent of the state’s population. Leica SmartNet gives GNSS users access to differential correction for any measurement application without the use of a base station. A Real-Time Kinematic (RTK) network is a series of permanent GPS and/or GNSS receiver stations whose combined data is used to generate corrections for rover GNSS receivers operating in the coverage area. The rover GNSS unit uses this correction data to improve the native accuracy of its measurement and location calculations. Strategic installation of SmartNet stations throughout California provides wireless RTK data access to nearly every GNSS user in the major population centers of the state.