How GPS * Works * G lobal P ositioning S ystem How GPS Works The Global Positioning System (GPS) consists of 24 Earth-orbiting satellites. These satellites allow any person who owns a GPS receiver to determine his or her precise longitude, latitude and altitude anywhere on the planet
If you know you are 625 miles from Boise, you could be anywhere on this circle.
If you know you are 625 miles from Boise and 690 miles from Minneapolis, then you know you must be at one of two points.
With three known points, you can determine that your exact location is somewhere near Denver, Colorado!
May 1, 2000
May 3, 2000
Examples of waypoints:
For Hiking GPS Recommendations:
For Auto GPS Recommendations:
WAAS is based on a network of
approximately 25 ground reference stationsthat covers a very large service area.