Maps, Apps, and Tracks

The text describes the process of creating an online map that tracks a marathon runner from a mobile device using Leaflet.js and deploying it with Fly. It covers drawing out the route, exporting data to KML format, displaying the map, setting up a server for location data collection, enabling the map to get updates, and finally deploying the app on Fly. The author also mentions potential improvements such as adding authentication, Redis support, or multiple runner tracking.