BAE > Extension > Agriculture & Environment > Precision Agriculture > Variable Rate Application - Does It Pay? Provides a summary of points to consider in the decision to adopt variable rate technology. An estimate of costs associated with selected variable rate technology services is also included. Demonstrating the Accuracy of Differential Corrections for Agricultural GPS in Louisiana [Image: Estimate Your Position with GPS] The objective of this study was to demonstrate the accuracy of commercially available DGPS signals used in precision agriculture in Louisiana. Global positioning systems (GPS) and GPS receivers allow users to estimate their position at various locations anywhere on earth.