Hi!
We have a avic x9310bt in our 2012 Subaru Legacy Limited.
The unit came with 2011 maps, which I updated in August 2012 with the update from Navteq.
Thinking that it must be time for the updated 2013 maps I was browsing through the Navteq site, when I came across the 'Subaru Map Update Toolbox'. It's a free utility that one installs on their PC and when you connect it (PC to the nav unit) it supposedly shows what updates are available. There are others for other brands as well as a generic one from Navteq. It downloaded quickly and installed without issue.
Has anyone used this? If so, did you connect your PC to the head unit with a usb cable?
Thanks