Navigation47
NavigationIntroduction to navigationIntroductionGeneral information
The current vehicle position is determined by means of the GPS system
(Global Positioning System). Sensors in the vehicle measure distances
driven. The measurements are adapted using the detailed information given
in the navigation data medium ma ps and according to the programmed
traffic management. Where applicable, TMC traffic reports are included in the
calculation of routes ⇒ page 70. The navigation system uses these data to
determine an optimal route to the destination.
The destination is defined by entering an address or a point of interest, e.g.
apetrol station or hotel.
Navigation announcements and visual guidance on the navigation unit and
the instrument panel direct you to your destination ⇒page 63.
Depending on the country, some radio-navigation system functions can no
longer be selected when the vehicle is travelling above a certain speed. This
is not a malfunction, but simply a legal requirement.
Navigation data
In normal circumstances, all the necessary navigation data is already stored
in the navigator. A memory card containing the navigation data can be
obtained from an Authorised Service to update this information ⇒page 48.
Additional Information:•Safety notes
’ ⇒ page 6
•Unit overview ⇒ page 8•Entering a destination ⇒page 52
•Destination memory ⇒page 58•Route guidance ⇒ page 63Note
Dirty or damaged navigation data media may lead to problems when copying
navigation information or even in the navigation itself. Store unused data
media in a suitable container or in the original box to protect them from
mechanical damage, heat, humidity or direct sunlight.Limitations of the navigation functionPossible errors in navigation
If the navigation system is not able to receive data from the GPS satellites
(dense vegetation, underground garage), it is still possible to navigate using
the vehicle sensory analysis.
In areas that are not or only partially digitised on the data medium
(e.g. insufficient definition of one-way streets and road categories), the navi-
gation system will still attempt to provide route guidance.
If navigation data are unavailable or incomplete, the navigation system may
be unable to determine the exact vehicle position. As a result, the navigation
may not be as exact as usual.
Navigation area and age of navigation data
The accuracy of the data (small villages, streets and house numbers)
depends on the respective version for the country.
Roads and streets are subject to constant change (e.g. new roads, changes to
street names and house numbers). After some time, navigation data will no
MediaSystem2.1_EN.book Seite 47 Donnerstag, 29. April 2010 4:18 16
