First- the coordinates take you to the visitor center, which then allows you to drive through the park on your way to the campground. I highly recommend entering Sage Creek Campground into your GPS at the visitor center, because it was a very long and winding road after that! Or, if you're short on time, put Sage Creek Campground in from the highway and you'll get there a lot more quickly (but miss out on some spectacular views!). Second- the campground was full when I got there, but I'm glad I had this app/read the reviews. People were very accommodating and you really can just pick an open patch of grass if it's full when you get there. Even though it was full, it was reasonably quiet. And I got to see bison and prairie dogs up close and personal...so COOL!!