Map Coverage
 

I just purchased a CPO 2015 Lexus RX 350 and I am trying to learn about the navigation system. I live in North Carolina, I think the car was originally sold in California. When I go to the Map Information Screen for Map Coverage it still show that the map coverage is the west coast of the U.S. Should I get the map coverage changed to North Carolina? Is this needed for the best use of the maps? If so is this something I can do myself or must the dealer do this? Thanks!