The orbits of GPS satellites are inclined to the Earth’s equator by about 55º. The system is designed to ensure that at least four satellites are visible at least 15° above the horizon at any given time anywhere in the world.
With the NOAA 200th Celebration coming to a close at the end of 2007, maintenance of this Web site ceased. Updates to the site are no longer being made.
The orbits of GPS satellites are inclined to the Earth’s equator by about 55º. The system is designed to ensure that at least four satellites are visible at least 15° above the horizon at any given time anywhere in the world.