Audiovox MS4150RS - Manual (Page 13)

Route & Sound – Navigating and listening to an
audio CD
With the new generation of our navigation radio units, you may insert
a map CD, plan your route, then insert an audio CD and the system will
still guide you to your intended destination. The navigation computer
saves the road system in a defined area around the planned route
(corridor) in its main memory. Within this corridor, the map CD does not have to be
inserted in order for the navigation to function. As soon as you leave this corridor, a
message will appear automatically, prompting you to insert the map CD so that the
navigation computer can reload the data required for a new route.
How does the navigation system work?
The position and movements of the vehicle
are recorded by the navigation system’s
sensors. The distance traveled 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.
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
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.
During the start-up sequence, it is possible that the navigation system will report:
“You are leaving the digitized area”. The navigation system assumes that the vehicle is
located outside a digitized 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.
9
GENERAL INFORMATION