Just picked my new Camaro up this past weekend and noticed the same thing.
If I read the instruction manual correctly you have to contact On-Star and get a subscription set-up. The manual doesn't have a section describing it's actual function as far as I can tell.
I intend to do the same thing myself later on in the year to set mine up. If anyone know more about it please chime in for us both.
Mail Clerk, did yours come with the NAV in the My link, it was a 795 option, if you did then there will be a button on the upper right side of the screen that says NAV, I will take a pict tonight if you want and post.
2013 LT2/RS, Crystal Red Metallic, TAZ Jr.
2016 H-D Ultra Classic, Black Fire Purple, (PPE)
2015 H-D Street Glide, Superior Blue. (Old Blue) Traded
2012 Big Horn, RAM, Crew Cab, SLT, Dark Cherry Red Pearl (Betty Boop)
1998 Honda Accord 2d, daily driver.