Continuously operating reference station (CORS) is a survey-grade GPS receiver at a known geographic location that continuously collects 3D positioning data. CORS data can support real-time kinematic (RTK) applications, meaning that the station provides continuous correction data to roving GPS receivers with internet-accessible capabilities.

 CORS provides accurate, repeatable positions, permitting you to return to the exact same locations every time. RTK also delivers excellent high-fidelity elevation data, making it valuable for installing tile lines or managing drainage.

CORS is available free of charge in 16 states (you still pay for cell service). Coordinated by the National Geodetic Survey of the National Oceanic and Atmospheric Administration, it provides Global Navigation Satellite System measurements. Besides farmers, CORS users include local, state and federal government; transportation; construction; emergency management; Homeland Security, surveyors; education; and natural resource staff.