I did not purchase this table for that purpose, but from all I know you cannot get GPS without an Internet connection, so with no WiFi, you would be SOL. I thing the tablet IS a 3g, you still need the connection to the internet.
I have added NAVFree gps navigation. After downloading I have used this app without a wifi or data connection. I have used this app on my old gingerbread as well as my Samsung Galaxy 2 tab jellybean. Most of the storage goes to sdcard. It isn