I used to use My Tracks app on my android. It was discontinued. . I haven't found one I like nearly as much. So I dug around and found my Garmin watch which I used to have attached to the cart shafts. It wouldn't power on, apparently I broke off one of the tabs that holds the battery. I just ordered a new Garmin, it should be delivered today. I like the watch attached to the shafts because you can see how fast (slow) you are going at any given time. It helps you develop a "feel" for your speed. I'll let you know how I like the new Garmin.