■
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 VDO Dayton 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.
■
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
USA
87
Real road network
Line pattern of the digital map
0
5
25
75
95
100
0
5
25
75
95
100
0
5
25
75
95
100
0
5
25
75
95
100
D:\LOB-AM\22sy330.00\MS3000_US.vp
Freitag, 12. November 1999 10:51:42
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