C 250 GPS update

I just bought a 2012 C 250 for the wife. Last week she used the GPS to go somewhere in Tampa, Florida. The darn thing led her on a wild goose chase. I had to find her on my iPhone and give here directions out of the wilderness.
What could be possible wrong with the navigation system on a 2012 car? Is an update recommended?
I did try to update the navigation on line, but apparently it has to be done at the dealership?
Thanks for any help on this
As an aside, it's always a good idea to have the nav up-to-date but I wouldn't expect the 2012 maps to be so wrong.
Good luck.
I looked at the w205 description and it shows the C 250. The w204 does not.
Gentlemen, am I in the right forum?
Thanks






