VDO MS 3000 User Manual page 9

GENERAL
Start-up behaviour
When starting up, the navigation system may tell you: "You are leaving the
digitized area". The navigation system supposes the vehicle in an off-road
position. If there are other roads in this position, the system may send
inappropriate messages. This means that the navigation system supposes the
vehicle is on one of the other roads.
When the vehicle has been at a standstill for a longer period of time, the
navigation function may be temporarily inhibited. The system will operate
reliably again once the GPS reception is available in sufficient quality.
Limited GPS Reception
Functional disturbance may also occur if GPS reception is interrupted or
interference occurs over a distance of several kilometres.
GPS reception may be interrupted or interference could occur:
–
In between high buildings.
–
In multi-storey car parks or garages, in tunnels and under bridges.
–
In forests or tree-lined avenues.
–
During heavy rain showers and thunderstorms.
–
Unfavourable satellite constellations in conjunction with the mounting
position of the GPS antenna (in this case GPS reception may be obstructed
for a longer period).
– In valleys and in mountainous regions.
If the GPS antenna has been properly installed, sufficient GPS reception should
be present about 95 % of the driving time. If interference in the reception
occurs more frequently, improper mounting of the GPS antenna may be the
cause. In this case, we recommend you to contact your VDO Dayton dealer.
However, the navigation system is able to compensate reception problems over
a period of a few minutes without functional interference.
10
When the vehicle is parked for a longer
period of time, the satellites move on
during this period. Therefore, when the
ignition is turned on again it can take a
few minutes before the navigation system
can pick up enough satellites and evaluate
the received signals.