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The digital road map
To plan a route to a destination address not only the current car position is needed by
the navigation system but also a digital road map is required where the destination
address itself as well as the roads leading to the destination address are stored. This
digital road map is located on the map CD you insert in your navigation computer.
On the map CD the road network is stored as a line pattern, which means that even
extensive intersections only have one center point all roads lead to. That’s why the
navigation system indicates the distance to the next turn as the distance to the center
of the intersection. Therefore the distance indications for highway exits given by the
navigation system may be different from those on the highway signs. The highway
signs refer to the distance to the beginning of the exit.
Areas with limited road attributes
In some areas not all attributes of a road are available on the map CD. For example
information on prohibited turning, one way streets or pedestrian areas are missing.
If you are entering this kind of area the navigation system will show you a warning.
The local traffic regulations always have priority over the advice given by the
navigation system. Always obey road signs and traffic regulations.
Latest map CDs
Approximately 10-15 % of the traffic network is changing each year. Due to this
constantly changing conditions (newly built roads, traffic restrictions, etc.), a 100 %
correspondence of the digital road map with reality cannot be achieved under all
circumstances. We recommend to always use the latest version of the map CD for
navigation.
GENERAL INFORMATION
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Real road network Line pattern of the digital map