This report is intended to provide a high-level view of the evolving changes in satellite navigation services. Satellite navigation dates back as one of the first space applications. The report provides a chronological review of the development of the Global Positioning System (GPS), its current state, changes affecting the transition to a future state, and speculation on what that future state may bring. A detailed discussion of satellite navigation accuracy, integrity, and availability provides further perspective on the issue and an understanding of the seemingly relentless pursuit of better performance. A short discussion of GPS governance and budgeting reveals the system's greatest challenges. The author also provides specific responsibilities of the Department of Homeland Security (DHS) with regard to space-based positioning, navigation, and timing policy. After 10 years of research and planning, one can finally see new technologies in orbit. The first 'modernized' GPS satellite with two frequencies for civil use was put in operation on December 16, 2005, and the first European Union Galileo test satellite was launched December 28, 2005.


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