This is what the OnStar site says...still trying to figure out my username however:
Find your destination at maps.google.com.
Click "Send" in the maps or directions results. Then select "Car" in the pop-up window
Log in using your vehicle’s make and OnStar username.
In your vehicle, push the Hands Free Calling button and say "Virtual Advisor."
Follow the prompts to retrieve your saved destination.
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