We have a page on our site mentioning possible sports-related applications of Real-Time Positioning Systems (RTLS). Especially for karting we’ve done quite some field experiments. We’ve developed a tag optimized for this use. Our karting tag can be powered on-kart and interface with a CAN bus, enabling deep integration with (semi-)electrical karts.
By integrating RTLS data into karting systems you can provide better race visualisation. But there are many other possible applications, including indicating the distances between racers, interactively slowing down racers when there is a dangerous situation, providing location-based interactivity, and so on.