How Does The Navigation System Work - VDO MS 4200 RS Owner's Manual

GENERAL INFORMATION

How does the navigation system work?

Important notes on the function of your navigation radio
In principle, the system is functional with poor GPS reception, although the accuracy of
the positioning may be impaired by poor or interrupted GPS reception or errors can
occur in the determination of the position, which result in incorrect position reporting.
Start-up characteristics
During the start-up sequence, it is possible that the navigation system will report:
"You are leaving the digitised area". The navigation system assumes that the vehicle is
located outside a digitised area. If other roads exist in this area, the navigation system
may issue incorrect messages. The navigation system assumes that the vehicle is located
on another road.
Comments
After transport of the vehicle by train or ferry, the navigation system may require a
few minutes for exact positioning.
After disconnecting the vehicle battery, up to 15 minutes may be required for exact
positioning. For this, the vehicle must be outdoors and the system must be switched
on in order to receive transmissions from the GPS satellites.
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The position and movements of the vehicle
are recorded by the navigation system's
sensors. The distance travelled is determined
by the vehicle speedometer signal, rotary
motion in curves is detected by a gyro sensor
(inertial compass). The position is
determined via the GPS (Global Positioning
System) satellites.
The position can be calculated within a
range of approx. 10 m by comparing the
sensor signals with the digital map on the
navigation CD.
If the vehicle is parked for longer periods of
time, the satellites continue their orbit. After
the ignition is switched on, it may take several
minutes until the navigation system receives
signals from sufficient satellites for evaluation.