2007 Mercedes CL-Class Owner's Manual - Page 154

Control systems COMAND navigation (introduction) General notes Operational readiness of the navigation system following a system software update by an authorized Mercedes-Benz Center After a system software update by an authorized Mercedes-Benz Center, the installed map software may no longer be compatible. If this is the case, the navigation system will not be operational. You will know if this is the case, when the following message will appear when you switch to navigation mode: "The system software has been updated. The map software must be updated now. Please insert the DVD with the map software." Updating map software: Proceed as described in the "Updating the map software" section ( page 149). Use map software which is compatible with the system software. 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. 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. 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 no reception at all, e.g. in tunnels, in multistory parking garages or there is snow covering the trunk lid where the GPS antenna is located. If there is snow on the trunk lid it should be removed. 153