sxsinmylxs

I'm getting an 04 or 05 RX330 and would like to purchase one with a navigation system. On a recent ebay search I found a navigation module. I'm trying to find out if all I need to do is swap out the consoles and hook up some harnesses.
Is it that simple or do you need a specific gps antenna and a gps controller?

here's the link
http://cgi.ebay.com/ebaymotors/ws/eB...MEWA%3AIT&rd=1

Thanks in advance, Chris