Tim Norris estimates that an RTK auto-steer system costs $18,000-$25,000. With this system, there are 3% fewer acres to plant, which translates to 3% less seed, labor and fertilizer used. For a system that costs $18,000, it would take 3,333 acres to see ROI, while a $25,000 system would take 4,629 acres to see ROI.