Navigation 35The route guidance is provided byvoice commands and an directionarrow, as well as with the aid of amulti-colour map display.TMC traffic information systemand dynamic route guidanceThe TMC traffic information systemreceives all current traffic informationfrom TMC radio stations. If dynamicroute guidance is active, thisinformation is included in thecalculation of the overall route. Duringthis process, the route is planned sothat traffic problems related to pre-selected criteria are avoided.If there is a traffic problem duringactive route guidance, depending onthe pre-settings, a message appearsas to whether the route should bechanged.TMC traffic information is displayedon the map display as symbols or asdetailed text in the TRAFFICMESSAGES menu.To be able to use TMC trafficinformation, the system has to receiveTMC stations in the relevant region.Dynamic route guidance only works iftraffic information is received via theTMC traffic information system.The dynamic route guidance functioncan be deactivated, see chapter"Guidance" 3 63.Map dataAll required map data is stored on anSD card provided with theInfotainment system.Detailed descriptions on map SD cardhandling and replacement, seechapter "Maps" 3 69UsageControl elements and menusThe most important control elementsand menus for the navigation systemare as follows:MAP button and map displayPress the MAP button to show themap of the current location and theroute to follow (if route guidance isactive).Detailed description on theinformation shown on the mapdisplay, see "Information on the mapdisplay" below.NAV button and NAVIGATION menuPress the NAV button to open theNAVIGATION menu.