User manual

General Information
123
English
Comments
After transport of the vehicle by a vehicle transport train or ferry, the navigation sys-
tem may require a few minutes for exact positioning.
After disconnecting the vehicle battery, up to 15 minutes may be required for exact
positioning. In order to do so, the vehicle must be outdoors and the system must be
switched on in order to receive transmissions from the GPS satellites.
The system is capable of functioning temporarily, even without valid GPS data, but
the precision of the positioning may be limited. The satellite symbol in the GPS win-
dow changes from red to green as soon a precise position has been received via GPS.
On main roads, the distances to exits indicated by the system deviate from those indi-
cated by road signs. The road signs on main roads refer to the start of the exit, while
the navigation system always indicates the distance to the end of the slip road. This
corresponds to the point where the driving lanes fork (separate).
Registration
After purchasing VDO Dayton Multimedia System please complete the enclosed
reply card and return it to the address indicated.
How does the navigation system work?
Determination of vehicle position
The position and movements of the
vehicle are recorded by the navigation
system via sensors. The completed distance
is determined by an electronic tachometer
generator, rotary motion in curves by the
gyroscope (inertial compass).
However, the information provided by
these sensors is not always precise. The sen-
sor values alter as a result of wheel slip,
changes in the tyre pressure due to temper-
ature variations, etc.
It is possible to correct sensor inaccuracies over a certain period of time (several min-
utes) by the comparing the signals with the digital map. However, the signal pro-
vided by the GPS satellites is required in order to correct the data over a longer
period of time.
DE-IT-E_MO_MS5000.book Page 123 Sunday, November 7, 1999 10:57 PM