Dual XNAV9525 - Manual (Page 4)

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XNAV9525 GPS NAVIGATION SYSTEM
As you travel, your navigation system functions as your copilot, providing turn-by-turn
visual and voice guidance to direct you to your selected destination. Because the system
knows where you are and where you want to go, it can quickly calculate step-by-step
directions that provide a route to any destination available on the included navigation
map. The map includes millions of roadway and mapping destinations, and
pre-programmed point of interest (POI) locations in over 50 categories. Simply enter your
desired destination into your navigation system, and its advanced intelligence does the
rest.
With your navigation system, if you deviate from the planned route, the system will
automatically recalculate the route to determine a new one from your current
location.
The navigation system uses Global Positioning System (GPS) satellites, and a digital
roadway map database to calculate and display travel directions. The system’s GPS
antenna receives signals from a constellation of 24 satellites orbiting the earth and uses
the strongest of signals, to determine your position to within meters. The navigation
system’s sophisticated software provides the highly accurate positioning necessary to
provide real-time, accurate, turn-by-turn route guidance.
Vehicle Position
The navigation system’s computer considers vehicle speed and heading changes,
together with longitude and latitude information, to accurately determine vehicle heading
and position on a digital map. This information is relayed to you as you proceed to your
selected destination through audible suggestions, turn symbols, and the on screen map.
Signals from GPS satellites are used to determine the vehicle location. Three (good) or
four (best) satellites must be received to accurately determine location. The GPS
reception status is indicated by the GPS icon on the map. See the map display section on
page 19 for more information.
Map and Information Database
The map database used by your navigation system was created using high-resolution
aerial and land based data collection and is stored on a hard disk drive. This data is
enhanced with useful travel information, such as freeway signage and over two million
points of interest locations in over 50 categories, such as tourist attractions, gas stations,
airports, and restaurants.
Car navigation maps are frequently updated. While the database was judged to be as
accurate as possible at the time of its release, a map database can never be 100%
accurate. Road information that is maintained in the map databases, such as turn
restrictions or road names may change over time. In addition, points of interests, such as
restaurants, hotels, and gas stations, also change over time. The complexity of
keeping this directory current means that some information may be missing or
out-of-date at times.
Introduction to Your Navigation System