Appreciate all the information. In trying to piece together all the posts wish someone would outline the differences in the updated version, i.e. improvements, additional mapping information, visual additions. It would also be great is one would advise that the update is worth the cost. We would like to improve our 2004 Gx 470, but to be honest, if the change is not great we will just use our Garmin. Please advise. Thanks.
Ordered latest update verson from local Lexus dealer today. Will post how it works. Cost 260.00. Installation by dealer is free.
Dealer installed latest navigation version last Thursday. Works perfectly. Noticed newer updated lane and road identifications. Although the disk cost $260.00 ( free installation ) it works well.