I just bought a 2007 RX 350 and it came with the 6.1 Navigation DVD. I have been reading many posts of people having limited access to the Nav system while vehicle is in motion. My system does not do this this and I am assuming that a DVD upgrade might add this "feature" to the system. So it seems that these DVD disk updates are not only map data, but also are firmware or software updates as well? Should I just stay at 6.1? Is there any version comparison, e.g. 6.1 vs 9.1, etc?

http://www.lexusoverride.com/

 

Actually...your 6.1 version "took away" the nav override capability that was available in version 5.1 - as has ever version after. There are descriptions on this forum about how to create a hybrid DVD that blends the core 5.1 feature that supports override with your 6.1 map data. However, you would need a legal copy of 5.1 to accomplish this. My understanding is we are up to 9.1 for the generation 5 nav systems like that in your RX350.

 

It goes against all I've read so far, but I'm able to do everything with my 6.1 disk running. Dial phone, nav changes while in motion... it doesn't appear to be crippled at all. I just don't want to lose what I have. Do the newer disks write something to the drive firmware? If I have a problem with the 9.1 disk won't it revert back to the functionality of 6.1 if switch it back?