Helpful app.
This is a nice little app that does what it advertises. You need to have the map displaying the entire area you want to trace, because you cant move the map around without having to start tracing again from the beginning. Would be nice if the map slowly scrolled when you got towards the edge of the map, so you could trace a route that is inconvenient to fit on a small phone screen.
Timothy Rohrbach about
Distance Measurement