GPS Positioning SLI is proud to offer the widest variety and configurations of GPS Machine Control solutions available on the market today, all custom-fit for your specific application. GPS Rovers Consistently accurate and easy to implement, laser-based machine control can help your company jump to the next level, while also maximizing your initial investment. Laser Automation These field-proven laser receivers thrive in a variety of harsh environments and conditions, giving you reliable measurements each and every day. Sonic Automation With these sonic solutions, your machines can remain on-grade, and on-budget. Plus, all of our sonic systems feature attractive upgrade paths to full GPS positioning.