Not true. My nav works perfectly fine without paid UVO subscription. Paid UVO is only for internet assisted POI searching/routing and internet assisted voice recognition.
owners.kia.com
Nav/POI
Still works without paying if you are fine with pre-loaded map data. (ie. equivalent of Garmin gps device) Only time a lot of people would use on-board nav is when they find themselves outside cell service range for using smartphone nav.
Just wanted to say THANK YOU for this. UVO rep just told me that ONLY the Ultimate package included Navigation. I just renewed at the second tier Plus level and she told me that navigation would be DISABLED unless I paid for the top tier Ultimate package. Oh boy am I pissed.