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Ltz avalanche head unit

one thing with mine (I had an '0:cool: the screen would flip down to install the NAV disc ... on the 13's there is only one slot ... the screen does not move ....

I also think the '13's have a hard drive in them where the '07's did not ....

John
 
I have an 08 LTZ with the touch screen Nav. The Bluetooth option was introduced in 2009 and up. 2013 is just a upgraded version. Nothing different than Bluetooth. 
 
There was a significant change in 2012 (USB was added earlier as my 2011 LS had it). GM added a HDD based NAV head unit that is by far the best system I have used. It has 20G of storage for music, no annoying CD whine with NAV, pause live radio for 20 min, memorize new roads, and split screen NAV/Audio. They will not work in older models, and its my understanding that blue tooth is linked to the on star module. I HATE the wife's 2014 my link system in comparison. 
 
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