經安全檢測,此網站為安全網站,請放心前往原始網址!

Navigation Programs - Global Positioning System

The Federal Aviation Administration is responsible for the safety of civil aviation. ... GPS Basics The Global Positioning System (GPS) is a space-based radio-navigation system consisting of a constellation of satellites and a network of ground stations u

www.faa.gov

網址安全性掃描由 google 提供