A:AnswerHi,
A map update will install the newest version of the preloaded mapping to your Garmin device. Map updates require a PC or Mac that meets the system requirements for Garmin Express. For more information:
http://support.garmin.com/support/searchSupport/simpleCase.htm?caseId={f4ee0930-4078-11e2-e8a7-000000000000}&kbName=garmin
A traffic update will receive real-time FM traffic data to let you know of any reported traffic incidents that affect your route.
-NM