Cadillac SRX 2010 Navigation Systen Update HELP !
 

The Navigation System inside my Cadillac is to old for todays streets in Mexico, but I have no idea about how can it be upgraded. Can it be done by using one of those DVD we can get on the internet ? Or it can only be done by taking the car to the shop ? Please help ! Is this model compatible with DVD updates or not !? Thanks in advance for the help.