Appendix; What Is Gps; The Gps Information Page - Mopar Navus Owner's Manual

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What is GPS?

The Global Positioning System (GPS) is a satellite-based navigation
system made up of a network of 24 satellites, that were placed
into orbit by the U.S. Department of Defense. GPS was originally
intended for military applications, but the government made the
system available for civilian use in the 1980s. GPS works in any
weather condition, anywhere in the world, 24 hours a day. There are
no subscription fees or setup charges to use GPS.
GPS satellites circle the earth twice a day in a very precise orbit
and transmit signal information to Earth. The GPS receiver that is
located in your Navus takes this information and uses triangulation to
calculate your exact location. Essentially, the GPS receiver compares
the time a signal was transmitted by a satellite with the time it was
received. The time difference tells the GPS receiver how far away
the satellite is. Now, with distance measurements from a few more
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satellites, the receiver can determine your position and display it on
the Navus's Map page.
A GPS receiver must be locked on to the signal of at least three
satellites to calculate a 2 Dimensional position (latitude and
longitude) and track movement. With four or more satellites in view,
the receiver can determine your 3 Dimensional position (latitude,
longitude, and altitude). Once your position has been determined, the
unit can calculate other information such as speed, bearing, track, trip
distance, distance to destination, and sunrise and sunset times.

The GPS Information Page

The GPS Information page provides a visual reference of GPS
receiver functions, including current satellite coverage, receiver
status, and position accuracy. To access this page, press the Navus
MENU key. From the Menu page, select Information. Then, select
GPS Information. The GPS Information page appears.