At a glance: Non-drafting triathlon rules require athletes to maintain a 20-meter separation on the bike course, a distance impossible for referees and athletes to judge accurately at race speed. RaceRanger built a combined automated drafting detection system and athlete tracking that utilizes ultrawideband sensors in combination with GNSS, but achieving the centimeter-level precision needed to complete the system required solving a fundamental positioning problem. Point One’s RTK corrections network provides the continuous, centimeter-accurate location data that makes objective drafting enforcement and highly accurate athlete tracking data possible across diverse race conditions.
The problem: Making an unjudgeable call
In non-drafting triathlons, the 20-meter (previously 12-meter) rule exists to prevent cyclists from gaining an aerodynamic advantage. Break it, and you face a time penalty. The challenge? No referee can accurately judge 20 meters between moving cyclists traveling at 40+ km/h.
Traditional enforcement relies on motorcycle-mounted officials eyeballing distances, an approach that’s inherently inconsistent and covers only portions of sprawling courses. Athletes question calls. Referees second-guess themselves. And the sport’s competitive integrity depends on judgments that are, by definition, subjective.
RaceRanger set out to replace subjective observation with objective measurement. The technical requirement was unforgiving: for a 20-meter threshold, the system needed to maintain 10-centimeter accuracy, multiple times per second, on every type of terrain a triathlon course might cover.
The technical challenge: When GNSS isn't good enough
RaceRanger’s core innovation uses ultrawideband (UWB) radio to measure precise relative distances between nearby cyclists, supplemented by mesh networking and GNSS positioning. UWB excels at measuring the gap between two riders, but loses accuracy when line of sight is blocked by a bicycle or its rider. For the system to work seamlessly in all situations across an entire course, each device needs to know its absolute position with similar precision.
Standard GNSS positioning provides meter-level accuracy under good conditions, often worse under tree cover or near buildings. For a system where 10 centimeters determines whether a penalty is issued, or whether one athlete has edged in front of another, that’s unusable. The math is straightforward: you can’t enforce a 20-meter rule with positioning technology that has a 2-3 meter error budget.
The solution: RTK corrections as ground truth
Point One’s correction network delivers Real-Time Kinematic corrections, GNSS corrected data that accounts for atmospheric interference, satellite clock drift, and orbital errors. By comparing signals from a global network of precisely surveyed base stations, this RTK network generates corrections that refine raw GNSS measurements from meter-level estimates to centimeter-level fixes.
For RaceRanger, this transforms their devices from “approximately located” to “definitively positioned.” The integration provides three critical capabilities:
- Absolute spatial reference: Every athlete’s device maintains a precise global position that serves as ground truth for the relative measurements from UWB sensors.
- Course-wide coverage: Whether the course runs through downtown streets with signal multipath, under forest canopy, or across open coastline, RTK corrections maintain consistent accuracy across varying GNSS conditions.
Rapid deployment: Point One’s network coverage and fast convergence times mean RaceRanger’s system achieves centimeter accuracy within minutes of power-on at race venues worldwide.
How it works: Two feedback loops
RaceRanger’s on-bike devices create two parallel systems from the same sensor data:
Athlete feedback: A rear-facing LED array gives the trailing cyclist immediate visual feedback, orange when approaching the draft zone, blue when just outside it as a last warning, and flashing red once inside the illegal zone. Because the position data is RTK-corrected, these alerts are precise enough that athletes learn to trust them, effectively self-regulating their position.
Referee enforcement: Currently the referees see the same thing the athletes see and need to eyeball the lights to enforce the rules. But RaceRanger have it on their short term roadmap to stream device data wirelessly to a referee tablet application. Here, Point One’s accuracy becomes the foundation for remote rules enforcement. The system calculates cumulative time each athlete spends in the draft zone and generates a ranked violation list. Referees can review specific incidents with GPS track overlays, assess patterns across the race, and issue penalties based on objective data rather than momentary observations from a motorcycle.
The result is a shift from “I think I saw something” to “the data shows 47 seconds of draft zone violation, even though I’m not right there seeing it happen”.
Impact: Adoption at scale
The technical validation came in 2024 when Ironman adopted RaceRanger across its entire Pro Series calendar as well as being used at the Paris Paralympics. For the world’s largest triathlon organizers to mandate electronic drafting detection represents a fundamental confidence in the measurement accuracy, confidence that rests on the centimeter-level precision Point One’s RTK network provides.
The system currently operates at 40 professional events annually, which will increase to over 70 in 2026. Referee disputes have dropped significantly because athletes can see the same data officials use. The light indications direct enforcement attention to clear offenders rather than marginal cases, making penalty decisions both more defensible and more impactful.
What's next: From pros to age-groupers
The professional field at an Ironman race might have 80 athletes. The age-group field has thousands. RaceRanger’s roadmap targets mass deployment, putting automated drafting detection on every bike in every major race.
This requires scalability at every step, as well as hardware miniaturization, cost reduction, and robust wireless connectivity. It also requires positioning technology that works reliably and is easily manageable for thousands of simultaneous users across a course. Point One’s network architecture scales naturally to this use case: RTK corrections don’t care how many receivers are using them in a given area.
As RaceRanger develops single-device systems with integrated cellular connectivity, enabling real-time spectator tracking alongside rules enforcement, Point One RTK remains the positioning foundation that makes centimeter-accurate, objective, automated drafting detection possible at any scale.
The technology that started with solving subjectivity in professional racing is building toward something larger: making every triathlon, at every level, definitively fair.
Ready to explore how Point One’s RTK corrections can embed centimeter accuracy into your service? Reach out to our team today for a personalized discussion and POC. Contact Sales