Mercedes-Benz S 320 CDI, Owner'S Manual, Page: 160 / 588

138
Operating systems
COMAND navigation system* (introduction)
GPS reception
Correct functioning of the navigation sys-
tem depends amongst other things on GPS
reception. In certain situations, GPS recep-
tion may be impaired, there may be inter-
ference or there may be no reception at all,
e.g. in tunnels, in multi-storey car parks or
due to snow on the GPS aerial. If there is
snow on the GPS aerial, you should remove
it. The GPS aerial is at the back of the vehi-
cle roof.
Route guidance after vehicle transpor-
tation
COMAND has to redetermine the position
of the vehicle if the vehicle has been trans-
ported (e.g. by ferry, by car sleeper train or
after towing).
Positioning takes place automatically even
when COMAND is switched off. The dura-
tion will vary from one case to another.
Route guidance may be restricted as fol-
lows during vehicle positioning:
앫
Navigation announcements, route
guidance displays and displayed street
names are not consistent with the ac-
tual location of the vehicle.
앫
COMAND does not generate navigation
announcements.
앫
Instead of the route guidance displays,
you see the “Off road” display and a di-
rection arrow. The direction arrow
shows the compass heading to the des-
tination.
When positioning is complete, route guid-
ance is resumed using navigation an-
nouncements and route guidance displays.
Interrupting the journey during route
guidance
The following applies if you interrupt the
journey during route guidance and contin-
ue the journey later on:
앫
COMAND resumes route guidance au-
tomatically if you continue the journey
within 2 hours.
앫
Route guidance is cancelled if you con-
tinue the journey after more than
2 hours. It will be necessary to resume
the cancelled route guidance manually
(
컄
page 178).
i
Interrupting the journey means parking the
vehicle and switching off COMAND.
Continuing the journey means switching
COMAND on again and driving on.
Hard disk errors
COMAND has an integrated hard disk on
which the map software is stored.
If an area of the hard disk has an error,
COMAND can no longer access the map
data in this area, for example, when calcu-
lating a route.