Hi New to the forum, try to find the topic but couldn't find. I do have a 66 Yaris Icon Auto, which comes with the Touch 2 system. I am considering adding the Nav function, so I found the hardware unit on ebay for about £250 (doesn't come with a GPS antenna). For any of those who have the Go function build in, is it worth. Secondly, how easy would it be to add the functionality (adding the unit itself shouldn't be a problem, but where does the receiver antenna go?) I am open to any advise and suggestions, And if anyone has done it, Were there any additional costs other then the unit itself (eg. programming, additional hardware or software) Thanks in advance.