
12
Basic principles
TP
WESTSTRASSE
017
GPS
75 km
MITTELSTRASSE
FM2
5
ffn
ENTER ruft die Kartendarstellung auf
How vehicle navigation works
1. The driver enters the desired destination using the operating
and function keys.
2. The position of the destination is determined using the street
map on the CD-ROM.
3. The navigation control unit calculates the current vehicle
position accurate to approx. ±100 m using the satellite data
it receives.
4. The vehicle position is determined by dead-reckoning
navigation accurate to ± 5m and by comparison with the
digital map data stored on the CD-ROM.
5. The navigation control unit calculates the distance, the
direction of travel, the change of direction of travel, etc.
6. Route recommendations are then output in the form of
visual and audible messages.
7. During the trip, the distance travelled is measured on the
basis of the wheel speed pulses generated by the ABS
wheel speed sensor and changes of direction sensed by the
angle of turn sensor.
8. The system continuously monitors whether the driver follows
the route recommendations.
9. The system tells the driver when he has deviated from the
recommended route.
10. If the driver stays on this route, the system recalculates the
distance to the destination.
11. When you reach your destination, the driver hears the
message “You have reached your destination“.
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