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National Security Telecommunications Advisory Committee, NSTAC Report to the President on Commercial Communications Reliance on the Global Positioning System (GPS) (Feb. 28, 2008) (full-text).
This evaluation focuses narrowly on the commercial communications industry's use of and reliance on GPS, in accordance with White House direction to tailor the effort to enable a quick response. The NSTAC notes that reliance on GPS signals in military, maritime, aviation, and other civil environments varies widely depending on the specific use and application. GPS-based precision-guided munitions, maritime harbor approach and constricted waterway navigation, and aviation approach and landing are examples of critical applications with varying positioning, navigation, and timing (PNT) requirements supported by GPS.