I updated to the latest firmware the other day and decided to run the NAV.DB as well while at it and I got a "database too large" message.
I've never seen this before. I made sure I downloaded it from the Mini X page. It's 7.2 megs.
Database too big
Re: Database too big
This means the wrong function was used to try to load it. Look for the "Load Navigation Database" function. Don't try to load a NAV.DB file with "Update User Database" below it because that's for a different type of database (which has a lower size limit).