Would someone with actual positive experience help me understand which VERSION of the ⅔ Navi Disk upgrade/update disk is the latest version that will work properly in my 2002/2003 Lexus SC 430 and where I can purchase one at a reasonably low price online? I have read the previous posts on this subject but am having some difficulty find a straight-forward answer to this question. I am a newbie on this board and am a little challenged in interpreting posts, so please be patient with my need for clarity. Thanks in advance.
