Why RTK Accuracy Is Fundamental to Fair Racing
In our race management journey, we've had the opportunity to work alongside a wide range of Principal Race Officers. They all take fairness seriously, but this past weekend, working with a PRO I hadn't partnered with before, that commitment came through clearly in a way that stayed with me.
Race 6 was tight start. Two boats were advanced on the fleet, the PRO was sighting the line carefully, and our Velocitek RTK system was running. Then:
PRO: "Oh, that was close. What does the system have?" Me: "All clear." PRO: "Who was closest?"
I glanced at the tablet and misspoke: "Bow 4."
PRO: "What about Bow 7?" Me: "My mistake — yes, 7 was closest. Bow 4 was second." PRO: "Good. 7 was definitely more advanced than 4. And if 4 had been over, I would have had to call 7 over too."
Here's the thing: that correction mattered enormously, and it's exactly the kind of correction an automated race management system cannot make.
A standard precision L1/L5 GPS race management system carries a positional uncertainty of roughly ±1 meter CEP50 on each boat and ±1 meter CEP50 on each line end. Stack those errors together and you have a combined margin that can easily exceed two meters, more than enough to swap the apparent order of two boats that were genuinely close. In this start, the separation between Bow 7 and Bow 4 was well within that margin. A standard precision GPS system could have shown 4 as the more advanced boat, cleared 7, and sent 4 back to restart alone. That would have been the wrong call.
RTK changes the math entirely. By resolving carrier-phase ambiguities against a fixed reference, RTK delivers centimeter-level accuracy, roughly 50 times more precise than standard GPS. At that resolution, the relative order of two boats near the line is not a guess; it's a measurement. The system told us unambiguously that 7 was more advanced than 4, and the PRO's visual observation confirmed it.
What made this exchange meaningful wasn't just the technology. It was her instinct to cross-check. She understood that fairness isn't just about whether an error is random; it's about whether the system is precise enough to get the order right. Random, uncorrelated GPS errors may be statistically fair in aggregate, but they are individually unjust when they cause the wrong boat to be recalled or a change in finish order. And unlike a human PRO who can pause, review, and reconsider, a GPS system has no such perspective. It simply reports what its accuracy allows, and if that accuracy isn't sufficient, the report can be wrong in ways that are obvious to some and invisible to others, with no mechanism to catch it either way.
That's the case for RTK in race management. Not just better numbers, but the precision required to make calls that are fair not just on average, but in the specific, contested, close-quarters moments that actually define a race.
Are you organizing an event that would benefit from Velocitek RTK? We'd love to hear from you.