Satellite Navigation Systems, Continued
The Navstar Global Positioning System (GPS) was developed to
provide highly precise position and time information anywhere in the
world, regardless of weather conditions. Now fully operational, GPS
consists of 21 satellites (plus 3 operational spares). See figure 8-28.
The precise stationing of these satellites will provide worldwide
coverage with a minimum of 4 satellites in view of any user.
Figure 8-28. Navstar GPS Satellite Constellation.