It's a pretty cool feature. Here's the link to sign up for it:
http://www.onstar.com/us_english/jsp/ovd/index.jsp
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H3 Boulder Gray - 2006 Adventure|CD-MP3|XM|Roof Marker Lights|Husky Front Mudflaps|Brush Guard|Rocker Bars|UC Protection|U-Steps|Garmin GPS|Garvin Roof Rack|DVD Headrests|
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