I used to use map my walk, an app that maps the route. They download the app onto their phone
But I find it easier just to record steps taken, I employ a 16yr girl who screen shots her steps to show the time she has worked and how many steps she has taken. I I know she worked 3 hrs and walked continuously 15k steps within those 3 hrs. She might dump the leaflets but why, she still would have to walk the same distance.
Steps taken is a better way to measure delivery because I want the leaflets to go out to big detached house which have big driveways so less leaflets go out but to better value homes.