The top half of the screen will show your navigation and the trail you are running
At the bottom, you have a choice to show either:
i. Speed, Time, Elevation, distance, or
ii. Pitch & Roll
When you run the trail, you can add in Points of Interest (by clicking on the + sign). You have about 30+ options to add in what you want to mark on the trail. The point will be shown at the Geolocation where you pressed the + sign. This works off-line as well. For many of the features, you are able to add in additional descriptions along with photos to enhance the information