2005-2006 GX470 Navigation update 2016 (1 Viewer)

[Dirtybird]

I got 15.1 U40 for the gen 5 nav unit. As far as I could find that was the most up to date version when I bought it.

What’s considered gen 5 ? I have an 08 that i would like to check to see if it needs updating or what is the latest update. Thanks