It is an application that allows you to measure the distance.
You can simply move to the point where you want to measure to launch the app, to know the distance easily.
With this app, need to prepare a measure for example, when you want to do the 100-meter dash is eliminated.
Until you see "100m" to launch the app, it can be accomplished if you walk.
If you want to measure the distance simply, it is an application available.