Constellation Status (USAF) - The Global Positioning System (GPS), like the internet, is global utility! Operated by the dedicated men and women of the 2nd Space Operations Squadron (2 SOPS) at Schriever AFB, CO (formerly Falcon AFB), GPS is also the world's largest military satellite constellation. 2 SOPS has three missions: global navigation, time transfer, and nuclear detection.     Current Constellation 1 2 3 4   Satellite Position and WAAS Status       Current NANUs 1 2 3       Support Center (USAF)   Advisories   Performance   Discrepancy Reports   GPS Satellite Tracking Current GPS Satellite Data (NIMA) - The following satellite information is provided by the National Imagery and Mapping Agency (NIMA) Satellite Geodesy Team. This information is supplied for all who have an interest in GPS.     GPS Data       Satellite Data   Supplemental   Block I Data   Block II Data   History USCG Navigation Center 1   provides quality navigation services that promote safe transportation, support the commerce of the United States, and directly benefit  world-wide international trade.   As a Center of Navigation Excellence, NAVCEN is proud to be at the forefront of United States transportation and navigation initiatives, leading the nation and the international maritime communities into the Twenty-First Century.   Also see GPS Timing Data & Information (USNO).   And Time.     (FAA) GPS Tutorials Differential GPS (DGPS),   WAAS       Some Measurements of Accuracy USFS GPS Information Page & Receiver Performance Reports   FAA - Latest GPS PAN Report (PDF) FAA - Latest WAAS PAN Report (PDF) Updated Civil GPS Performance Standard (Oct 2008) (PDF) GPS Accuracy Web Pages   from the National Geodetic Survey (NGS) GPS Accuracy Monitor   by Dennis Milbert Garmin Accuracy Report   by Wolfgang Rupprecht Circular Error Probable   by Logan Scott Garmins 25LP OEM Receiver Tested   by Storm Van Leeuwen S. GPS Accuracy Web Pages   by David L. Wilson Estimation of Trimble Scoutmaster DGPS Performance (1997)   by Sam Wormley GPS - Accuracy Statistics (PPS) (more)   GPS - perf_reports archive   IGDG (Internet-based Global Differential GPS) is a uniquely powerful and flexible C-language software package that provides a complete end-to-end system capability for GPS-based real-time positioning and orbit determination. STORM Time Empirical Ionospheric Correction Model Real time interface to compute neutral atmosphere delay in GPS measurement GPS Networks and Ionospheric Systems Development (JPL) GLONASS 2 3     © Copyright 2010 - Samuel J. Wormley   by swormley1@gmail.com