A “cute” press release from GM (emphasis mine on the last paragraph):

As kids across the country anxiously await Santa’s arrival, OnStar wants to help keep families aware of Ole’ St. Nick’s whereabouts.
On Christmas Eve, OnStar Advisors will provide specific location-based updates on Santa Claus’ annual trek around the world based on data received in partnership with the North American Aerospace Defense Command (NORAD).
Beginning at 7 a.m. EST on Christmas Eve, OnStar subscribers, including OnStar FMV owners, can press the blue OnStar button in their vehicles to request a “Santa Update.” OnStar advisors will share Santa’s current location through 5 a.m. EST Christmas morning.
“We see this holiday tradition as staying true to keeping subscribers connected in ways they never thought possible,” said Terry Inch, OnStar vice president, Sales, Marketing and Business Development. “We know many of our customers will be glad to know Santa’s location information is just one blue button press away.”
NORAD uses its North Warning Radar System, geo-synchronous satellites with infrared sensors and other technologies to monitor Santa’s Christmas Eve travels and share the information with children and families around the world.

Um, GM does know that NORAD doesn’t actually track Santa with “geo-synchronous satellites with infrared sensors and other technologies,” right?