GPS antenna

Hello all, I'm loving my Blue Streak Express. Hemi, 8spd, 3.21. Just got back from a week in CO in it. Hauled dirt bikes out, one in the bed, two on a small trailer, 3 guys and their gear. Got almost 16 mpg across KS (I'm in MO). Wow! That's "wow", great mileage! My '04 4.7 Dakota got around 11mpg over the same route. Got a question though, why does my truck have a GPS antenna? I don't have NAV. I have the Uconnect 5.0. Am I missing something here?