I have a 2006 Trailblazer LT and I am curious if the AVIC-Z1 will fit in it. Also does the navigation require nav disks or is it all stored on the harddrive?

no nav discs required, Nav runs via the HDD.

As to the trail blazer fit, I don't know that answer, but I bet you can find that out on the crutchfield web site.

yes it will fit. i have one in mine.
Keith

do you have any pictures? Also any suggestions when installing to the trailblazer? What fitment kit did you use?

To make the z1 fit in an 05 You have to cut out some plastic support for the back of the stock radio. As for the kit you can get a metra 99-3301 and just use the side brackets. I've done this several times in Trailblazers up to 05. From what I've seen of the 06 I don't see it bing much different.

or a metra 99-2003
Keith

I've tried the 2003 kit, it never worked properly for me, but then again that was in older trailblazers. Maybe the new one is different.