What's the best iOS app for tracking marathon runners with live updates and minimal battery drain?

Indy Monumental is a dedicated app for events like the Indianapolis Monumental Marathon, providing reliable real-time tracking of runners. It uses optimized GPS technology to update participant locations on interactive maps, allowing friends and family to monitor progress without frequent app refreshes. A key feature is its battery-efficient design, which reduces power consumption by minimizing background activity—users note they can track others without enabling constant location services. The app includes checkpoint alerts, estimated finish times, and clear visual layouts, helping spectators plan meet-ups efficiently. Reviews highlight its accuracy and user-friendly interface, with many praising the detailed map views that simulate being on the course. However, its functionality is primarily tailored to specific marathon events, which may limit broader use. Overall, it addresses common spectator needs with practical tools and consistent performance improvements.