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The term "navigation" (lat. navigare = to travel by sea) is ge-
nerally understood to mean the location of a vehicle, the de-
termination of the direction and distance from the desired
destination and the required route. As navigation aids, stars,
prominent landmarks, compass and satellites are used.
With OnlinePro, location is determined by the GPS receiver
(GPS = Global Positioning System). The direction and dis-
tance from the destination is determined using a digital street
map, a navigation computer and sensors. A speedometer and
reverse signal are additionally used to calculate the route. 
For safety reasons, route guidance follows predominantly in
spoken form supported by a direction indicator on the display.
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The requirements of the Road Traffic Regulations (RTR)
apply.
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Observation of traffic signs and local traffic regulations
always takes priority
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Traffic guidance is restricted to passenger vehicles. Spe-
cial driving recommendations and regulations for other
vehicles (e.g. commercial vehicles) are not taken into ac-
count.
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The destination must only be entered when the vehicle is
stationary.
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The navigation CD provided contains a digitised street map.
Motorways, federal and regional roads, as well as district
roads are detailed in this street map. Larger cities and commu-
nities are completely covered. The regional and unclassified
roads or access roads and the town centre for smaller towns
and boroughs are included.
One-way streets, pedestrian zones, turning bans and other
traffic regulations are taken into account as far as possible.
There may be discrepancies between the data on the navigati-
on CD and the actual local situation, due to permanent chan-
ges to road systems and their traffic regulations.