Navigation 69In the case of a traffic problem (e.g.traffic jam, closed road) on the routedriven, a message is displayed, and avoice message output indicating thenature of the problem. The driver candecide, whether to drive around thetraffic problem taking the suggestedchange to the route or to carry onthrough the traffic problem.Nearby traffic problems are alsoreported if route guidance is notactive.If route guidance is active, the systemcontinuously checks, based on thetraffic information, whether it wouldbe better to recalculate the route ortake an alternative route taking intoaccount the current traffic situation.The activation and deactivation ofdynamic route guidance, as well ascriteria for the calculation of the route,are made in the ROUTE OPTIONSmenu, see chapter "Guidance" 3 63.Dynamic route guidance only works iftraffic information is received via theRDS-TMC traffic information system.The possible delay due to a trafficproblem calculated by theInfotainment system is based on datathat the system receives via the RDS-TMC station currently set. The actualdelay may deviate from the calculateddelay.MapsAll map data required for use of thenavigation system is stored on an SDcard provided with the Infotainmentsystem.Map SD cardThe SD card reader of theInfotainment system can only readthe SD card provided specifically foruse with the vehicle's navigationsystem. The SD card reader cannotread any other SD cards.Due to production date of the mapdata on the SD card, some new roadsmay not be included, or some namesand roads may differ from those inuse at the time the map data wasproduced.To order additional SD cards or anupdate of the map data, contact aVauxhall Authorised Repairer.Replacing a map SD card, see below .