Navigation system on a TA?
The nav brain is mounted behind the plastic panel on the very back on the driverside.
The pic labeled "head2" is out of my first ta, in that car I cut out a little foam and put it under the driverside backseat. both have worked just fine. The picture is really just a flip out monitor, sorry I don't have a pic with the head unit closed. You can get all of the pics you need here http://www.alpine-usa.com/ Click on products & MMStations to see what Alpine has to offer. They list all of the retail prices, but it will probably be cheaper at actual stores.
I have the dva-900 in my car, The older pic was a cva-1005, Remeber that alpine is usually the most expensive stuff, other companies make less-expensive, but still good quality. I went with alpine because the alpine navigation is the best in my opinion.

