GradeStar machine control systems from Leica Geosystems provide automatic 3D control of motor graders and crawler dozers using either GPS or TPS sensors. Operators can choose, select and switch in the field. Version 4.2 allows for the same technology to be used for controlling both graders and dozers. Improvements include multiple radio modem configurations and a new intuitive menu for hydraulic tuning. Exclusive automatic side-shift technology provides flexibility and high degree of accuracy for blade control. Estimated list price: $87,000 to 93,000.