The Case IH ZTN87858 is a genuine RTK+ activation code designed to enable Real-Time Kinematic (RTK) correction signals, significantly improving GPS accuracy for precision farming applications. This code is essential for activating advanced guidance features on compatible Case IH and New Holland agricultural machinery equipped with AFS / IntelliSteer systems, ensuring precise field operations, optimized efficiency, and improved yield potential. It supports various models across tractors, combines, and sprayers.