GPS is a set of satellites run by the US Department of Defense, which broadcast radio signals that contain precise time and other information. A GPS receiver on the ground receives signals from several satellites and computes its exact location in three dimensions. Recent advances in GPS receiver design, computer processing power, real-time data processing algorithms and availability of rugged touch screen computers have enabled GPS based machine guidance system or grade control system. Site design in the form of plans or a digital terrain model, which is developed based on GPS data, is downloaded to the on-board computer which then works out where the machine is and how much cutting or filling is needed at that point by referring to the site gird. The computer makes the decision based on GPS data of the blade. The information is transmitted to the operator via the monitor or the light bars.

Fact Sheet ID Number



Equipment Automation


gps, earthmoving, navigation, equipment, construction



Date of this Version




To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.