0 GPSMAP 640 Owner’s ManualAutomotive Mode: Using XMTouch Save to save a channel to Presets (maximum of 20).Touch Delete to remove the current channel from your Presets.To delete more than one channel from Presets, touch Browse >Presets > Delete. A list of all your Presets appears. Touch theitems you want to delete. Touch Delete > Yes.Adjusting the VolumeTouch , and then use and to adjust the volume.Using XM Tra�fic �n�ormationTra�fic �n�ormationYour GPSMAP 640 can receive and use traffic information usingan optional XM smart antenna (such as the GXM 40). Whena traffic message is received, your GPSMAP 640 displays theincident on the map and can change your route to avoid the trafficincident.Note: Garmin is not responsible for the accuracy of the trafficinformation. The XM antenna receives signals from the XM trafficprovider and displays that information on your GPSMAP 640.Note: You can only access the traffic information if theGPSMAP 640 is connected to an XM antenna and you have an XMtraffic subscription (see page 69).••Tra�fic in Your AreaWhen you are receiving traffic information, a traffic icon appearsin the upper-left corner of the Map page. The traffic icon changescolor to indicate the severity of traffic conditions on your route orthe road you are currently travelling.Severity Color CodeColor Description MeaningGreen Low severity Traffic is flowingnormally.Yellow MediumseverityTraffic is slightlycongested.Red High severityTraffic is heavilycongested orstopped.Tra�fic on Your RouteWhen calculating your route, the GPSMAP 640 device examinesthe current traffic and automatically optimizes the route for theshortest time. If a severe traffic delay occurs on your route whileyou are navigating, the device automatically recalculates the route.You might still be routed through traffic if no better alternativeroutes exist.
