Yorkshire Three Peaks for Android
This app serves as a route guide for the classic anti-clockwise route starting at Horton-in-Ribblesdale, click the M Location button to check you're on the right track. Long-click any two points to get a distance along the route to help you plan where to stop for food or to camp overnight. There's also a helpful utility that shows sunset and sunrise times.
Feature graphic by Phil MacD Photography/Shutterstock
by K####:
Doesn't do much but track your way around... There is another app but not available for newer phones that is much better.