Mercedes-Benz COMAND control unit Operator's Manual page 53

After start-up or initial start-up, the navigation
system must perform a position finding
operation. As a result, you may have to drive
for some time until precise route guidance
takes place.
GPS Reception
The correct functioning of the navigation
system is also dependent on the GPS
reception. In certain situations, the GPS
reception may be impaired, distorted or even
impossible, e.g. in tunnels, multi-storey car
parks or due to snow on the GPS antenna. If
there is snow on the GPS antenna, you should
remove it. The GPS antenna is at the rear on
the vehicle's roof.
Route Guidance after Vehicles
Transport
After vehicle transport (e.g. by ferry, car train
or by towing) COMAND must determine the
vehicle location again.
Position finding takes place automatically
when the vehicle is driven off again, even if
COMAND is switched off. The actual length of
time may vary from case to case.
While the vehicle is determining its position,
route guidance is subject to the following
restrictions:
Navigation announcements, route
R
guidance displays and displayed street
names do not match the actual location.
COMAND does not issue any navigation
R
announcements.
The message Off Mapped Road and a
R
direction arrow are displayed instead of the
route guidance displays. The arrow
indicates the direction of the destination.
i
Direction arrow accuracy is also
dependent on correct vehicle position
and/or direction.
Once the position finding operation has been
completed, route guidance takes place again
via navigation announcements and route
guidance displays.
Interrupting Journey during Route
Guidance
i An interruption in the journey means
parking the vehicle and switching off
COMAND.
The continuation of the journey means
switching COMAND on again and
continuing to drive.
If interrupt the journey during route guidance
and continue it later, the following applies:
If you continue the journey within 2 hours,
R
COMAND automatically continues route
guidance.
If you continue the journey after 2 hours,
R
route guidance is cancelled. You will have
to continue the cancelled route guidance
again manually .
Hard Disk Drive
COMAND has an integrated hard drive on
which the map software is stored.
If an area of the hard drive has a fault,
COMAND can no longer access the map data
in that area for the route calculation, for
example.
The message Navigation Unavailable will
then be displayed.
X
To delete message: Switch COMAND off
and back on again.
i After switching on/off, the navigation
system will remain functional until it has to
access the faulty area of the hard drive
again. The message will be displayed again.
Contact a Mercedes-Benz Service Center.
Introduction
Z
51