My nav says "NA, BMW, 1.4.6, Road Map North America PREMIUM 2009-2

Can anyone give so some info on where to get an upgrade? I live in Florida (already posted on the above forum link the same question to see if I can get some answers there as well)

My dealer wants $500+ because "it needs some coding"... now,, they already ripped me off installing the tow hitch and I DO NOT want that to happen again...

Thanks for the help