What is the benefit of the update?
Updates are for either bug fixes or to add new capabilities.
There are three separate sections:
Operation system from Harman/Becker
Gracenotes available from Harman/Becker
Navigation Software from Navteq
the website Mofv.mom/mygig has updates for all the chrysler radio models. ie REN,RER, etc. there is also a forum there if you have questions.
Updates from Harman/Becker are free as they are from the jeep dealer, however the jeep dealer has, in my experience been two updates (read months) behind. The Nav software has been updated only twice since 07. The latest is a 2009 release. It cost $199.00. Before you buy it, go to the website and go thru the selection process to bring you to the update order page. Look at what the update covers as far as new cities, you may not want to spend that much money on an update that doesn't apply to any area that you normally drive in. Hope this helps.