With an active map open, tap the Map Tools icon (wrench), then tap Record GPS Tracks.
On the map, tap the Play/Start icon to begin recording. Your movements will be recorded when the app is open or when it is minimized to the background. Tap Done at any time to stop recording and to automatically save the track to the Tracks folder.
For more detailed track information, tap the track to show its label, then tap the label for more information.
Tap the "Show Graph" heading to open the speed and elevation statistics.
In the Track Statistics screen, the distance, elevation change and time are displayed. Tap Speed or Elevation to see its respective graph.