Yellowstone Mileage lets you calculate the shortest route & mileage between 2 end points in Yellowstone National Park (NP). The app is based on the Yellowstone NP map with squares added to indicate user-selectable points. These points are the park entrances, major intersections and campgrounds. You begin by touching one of these squares to select the origination point. Next you touch the square for the destination point. The app calculates the shortest route & mileage between these 2 points. The app highlights the route on the map & shows you the waypoints & mileage from your origination to destination. The app also shows whether the route is open seasonally. To find planned road opening & closing information, you touch the Road Dates button. The app shows you:
- a different map on which the roads are color-coded
- a schedule showing opening & closing dates
- contact information for obtaining real-time updates.

You can also select up to 5 waypoints to be added in this route. To add a waypoint, touch the Add Waypoint button. The app adds a line between the origination and destination points, indicating to touch a square for a point to be added as a waypoint. After you touch a square, the app:
- recalculates the route and mileage
- highlights this updated route on the map.
This lets you adapt the route so you can see attractions along the way or bypass road construction or closures.

You can swap end points and any waypoints you added by touching the Swap Endpoints button. Doing so, you can adapt your route to changed plans.

The app contains the data necessary to calculate the mileage & shortest route, so you don't need a cellular or Wi-Fi connection to use the app. The cellular & Wi-Fi coverage in Yellowstone NP is limited. Unlike apps that require a cellular or Wi-Fi connection, Yellowstone Mileage works anywhere.