If this link doesn't work, basically just go to www.navteq.com
and at the top of the page click on the Store. On the next page at the left hand column drill down - factory installed, jeep, grand cherokee, 2011, and pick the RHB .
I found it by logging on to the Owners section on www.jeep.com
and clicking on the Navteq icon on the bottom right of the page. When you get on the page at Navteq it says there is an update available for the RHB, RER, and one is expected for the RHR in the fall. When you click on the "This is my radio and I'd like to view the details" a page pops up that doesn't tell you too much but it has an "Add To Cart" button and says $149.