a few weeks ago, i updated to 2018 Q4 maps(southwestern usa) by sd card.  the other day, i was looking at avic-sync on the iphone, went to sales, and in there are also 2018 Q4 southwestern usa, plus north america.  do i need to download them to the iphone for Q4 maps to work?  is there anywhere i can look to see if everything has been updated?