2007 Mercedes S-Class Owner's Manual - Page 146

Control systems COMAND navigation (introduction) i Please note that the update must be allowed to run to the end in this case. If you interrupt it, the navigation system will continue to be non-operational. Initial use or use following a system software update In both these cases, the navigation system must determine the position of the vehicle. You may have to drive for a while before precise route guidance is possible. GPS reception Correct functioning of the navigation system depends on GPS reception, among other things. In certain situations, GPS reception may be impaired, there may be interference or there may be no reception at all, e.g. in tunnels, in multistory parking garage 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 back of the vehicle roof. Route guidance after vehicle transportation COMAND has to redetermine the position of the vehicle if the vehicle has been transported (e.g. by ferry, by train or after towing). Positioning takes place automatically even when COMAND is switched off. The duration varies from one case to another. Route guidance may be restricted as follows during vehicle positioning: Navigation announcements, route guidance displays and displayed street names are not consistent with the actual location of the vehicle. COMAND does not generate navigation announcements. Instead of the route guidance displays, you see the "Off Road" display and a direction arrow. The direction arrow shows the compass heading to the destination. When positioning is complete, route guidance is once again possible using navigation announcements and route guidance displays. Interrupting the journey during route guidance The following applies if you interrupt the journey during route guidance and continue the journey later: COMAND resumes route guidance automatically if you continue the journey within 2 hours. Route guidance is canceled if you continue the journey after more than 2 hours. It will be necessary to resume the canceled route guidance manually ( page 192). i The journey is interrupted if you park the vehicle and switch off COMAND. The journey is continued when you switch COMAND back on and start driving on. 145