The first of these new signals is for general use in non-safety critical applications. These signals complement the existing civilian service. A main component of the ongoing civilian modernization effort is the addition of two new signals. The good news for the aviation community is that GPS is being constantly improved and modernized. In those cases, even greater precision operations are possible. In some regions of the world, satellite signals are augmented, or improved for special aviation applications, such as landing planes during poor visibility conditions. Improved approaches to airports, which significantly increase operational benefits and safety, are now being implemented even at remote locations where traditional ground-based services are unavailable. In many cases, aircraft flying over data-sparse areas such as oceans have been able to safely reduce their separation between one another, allowing more aircraft to fly more favorable and efficient routes, saving time, fuel, and increasing cargo revenue. Vast savings in time and money are being realized. New and more efficient air routes made possible by GPS are continuing to expand. This has been especially true in areas that lack suitable ground based navigation aids or surveillance equipment. Procedures have been expanded to use GPS and augmented services for all phases of flight. Area Navigation allows aircraft to fly user-preferred routes from waypoint to waypoint, where waypoints do not depend on ground infrastructure. The trend toward an Area Navigation concept means a greater role for GPS. Space-based position and navigation enables three-dimensional position determination for all phases of flight from departure, en route, and arrival, to airport surface navigation. With its accurate, continuous, and global capabilities, GPS offers seamless satellite navigation services that satisfy many of the requirements for aviation users. Aviators throughout the world use the Global Positioning System (GPS) to increase the safety and efficiency of flight.
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