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In 2006, Caterpillar implemented new technology on several of its control and guidance products to provide customer access to a broader range of GPS positioning frequencies. This broader range of positioning frequencies allowed Caterpillar products, such as AccuGrade, CAES and Aquila Drill and Dragline Systems, to use the US NAVSTAR GPS system L5 and L2C frequencies. as well as the Russian GLONASS G1 and G2 signals. Customers located in the northernmost and southernmost regions of the world, such as northern Canada, Australia and southern Africa, will be most affected by this new release. In addition, those working in areas where line of sight to the sky is difficult, such as in dense tree-lined areas, urban sites encircled by tall buildings and deep pit mining sites, will witness improved uptime and capabilities.