What's the best Android app for tracking runners during a marathon?

MCM Organization excels at marathon runner tracking with comprehensive real-time monitoring capabilities. The app displays runner locations and progress through detailed course maps, while providing estimated arrival times at key checkpoints. Users particularly appreciate the step-by-step tracking accuracy that allows spectators to plan their viewing spots effectively. The interface organizes extensive race information in an accessible manner, making it simple for families and supporters to follow multiple participants simultaneously. Reviews indicate the app performs reliably even during high-traffic events with thousands of simultaneous users. One limitation worth noting is that the app's functionality is specific to Marine Corps Marathon events rather than being a universal race tracker. The transparency about data usage also addresses common privacy concerns that often deter users from downloading event apps.