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GPS page better than 3-meter accuracy http://www.gps.gov/systems/gps/performance/accurac... are accurate to within one meter "U.S Government: GPS accuracy" Government standards GPS page “worst case” accuracy http://www.gps.gov/systems/gps/performance/accurac... http://www.gps.gov/systems/gps/performance/accuracy/ "U.S Government: GPS accuracy" http://www.gps.gov/systems/gps... website http://www.gps.gov/systems/gps/performance/accurac... http://www.gps.gov/systems/gps/performance/accuracy/ GPS.gov GPS.gov http://www.gps.gov/systems/gps/performance/accuracy/ "U.S Government: GPS accuracy" http://www.gps.gov/systems/gps/performance/accurac... http://www.gps.gov/systems/gps/performance/accurac... “worst case” accuracy http://www.gps.gov/systems/gps/performance/accurac... http://www.gps.gov/systems/gps... http://www.gps.gov/systems/gps/performance/accurac... to 7.8 meters at a 95% confidence http://www.gps.gov/systems/gps/performance/accurac... http://www.gps.gov/systems/gps/performance/accurac... http://www.gps.gov/systems/gps/performance/accurac... http://www.gps.gov/systems/gps/performance/accurac... http://www.gps.gov/systems/gps/performance/accurac... better than 3-meter accuracy http://www.gps.gov/systems/gps/performance/accuracy/ http://www.gps.gov/systems/gps/performance/accurac... http://www.gps.gov/systems/gps/performance/accurac... website GPS.gov http://www.gps.gov/systems/gps/performance/accurac... 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