Sure....Just go to the GM website and follow the instructions. You will need you VIN number from your vehicle....here is the link.... https://www.gmnavdisc.com/overview.do;jsessionid=8794909DEF4791F6AC03E345793C4922
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The gm-481 has no update at this time and they don't plan on having one until 2010 (tech support call 4-15-09) and to top it of you have to send it to them at a charge of $100 and that is a total rip...
According to Customer Service at 800-216-5156, the unit must be returned to the company for any map upgrades. If the unit is still within the 1-year warranty period, the cost to update is $49.99 and...
GPS software is software that takes your location (usually via satellite) and then places it on a graphical map. Some software can even show directions to or from a location.