Navigation update release notes?

[memeuro]

Hi Folks,

I cannot remember where, but years ago I was able to search for my navigation system version and it would show the release notes by state and city with all the changes. I cannot find anything like that anymore and the dealer parts people didn't know either. I want to see what changes have been made in the GIS database before I fork over the cash for the update.

Anyone know where the release notes or change log for the various versions can be found online?

Many thanks.