The Trimble GCS500 Grade Control System is a cross-slope control system designed to be used on motor graders for fine grading work. The system uses two AS400 angle sensors and one RS400 rotational sensor to calculate the cross slope of the blade. The system lets the operator select which side of the blade is controlled, and switch sides on the return pass. The highly flexible AS400 has 100% slope capability, making the system ideal for a wide range of applications, including cutting road slopes, ditches and embankments. When you use the CB420 Control Box with the GCS500, you get software with a powerful range of features specifically designed for cross-slope and blade elevation on motor graders.