New guy here and just wondering about GPS

Hi there, I've had my hummer for about a year now and love it. Now i'm thinking about installing a factory navigation system does anyone here now about them.

There are many threads here regarding GPS. The general consensus is to go aftermarket because of things like upgradeable software and better map coverage areas.

Thanks, I've looked at a few but like the way the factory ones look. I like the Garmin the best