The AutoTrac Controller expands John Deere’s AutoTrac SF1, SF2, and RTK (real-time kinematic) compatibility onto select non-John Deere platforms. Users can integrate their John Deere GreenStar equipment onto more vehicle platforms that include select Case IH Magnum and MX Series Tractors. AutoTrac Controller is an improvement over the AutoTrac Universal (ATU) system. Also, AutoTrac RowSense Universal is a universal guidance option for combines designed for customers who grow corn and run older or non-John Deere machines. AutoTrac RowSense Universal is compatible with all combines approved for use with the AutoTrac Universal Kit as well as select models of John Deere and non-John Deere corn heads. It uses both GPS-based and mechanical-feeler data to accurately guide the combine on the corn row; reduces operator fatigue; and allows operators to more efficiently harvest downed corn or harvest in curve pass conditions while it helps the machine operate at peak efficiency throughout the day.