What’s happened? Researchers at the University of Otago, working with Google and the Chinese Academy of Sciences, have developed algorithms that let smartwatches determine their location with near-centimetre precision. Using multi-GNSS signals and advanced carrier-phase techniques, they demonstrated that a smartwatch device can achieve centimetre-level positioning precision, with roughly 8 cm error margin, over a four-hour stationary test run.
- The study was led by Robert Odolinski and his team from the School of Surveying at Otago, in collaboration with Google’s Android Context group and the Chinese Academy of Sciences.
- Using the Google GnssLogger app and combining carrier-phase signals from multiple GNSS systems (GPS, Galileo, BeiDou, QZSS), they achieved exceptional repeatability on consumer-grade smartwatches.
- The repeatability measured, with one-second intervals over four hours, resulted in positional scatter of approximately 8 cm (about 3 inches). This is less than twice the diameter of the watch used (≈4 cm).
Why this is important: This breakthrough completely redefines what smartwatches are capable of. While GPS first made its way to smartwatches back in 1999, older hardware and high power consumption made it impossible to capture the carrier-phase signals needed for such precision. But with modern chips and smarter energy management, that limitation is finally gone. The real game-changer? Affordable devices can now hit survey-grade accuracy, opening the door to smarter, more precise wearables.
Why should I care? Once this technology reaches consumer wearables, it could make smartwatches far more capable than they are today. For runners, hikers, and cyclists, centimetre-level precision means fitness tracking that’s no longer guessing; it’s exact. It also paves the way for better health insights, safer outdoor navigation, and smarter emergency features.
- More reliable workout tracking: Distances, routes, and pace data could finally reflect what’s actually happening on the ground.
- Improved safety outdoors: Enhanced GPS precision helps with location sharing and SOS alerts in remote areas.
- Better health insights: Accurate movement data could boost metrics like calorie burn, gait analysis, or even recovery tracking.
- Professional use cases: Surveyors, engineers, and rescue teams could rely on consumer wearables for location accuracy once reserved for specialist equipment.
Okay, so what’s next? The University of Otago team says this is only the beginning. Their tests were done under ideal, stationary conditions. However, the real challenge now is achieving the same precision while moving indoors or in dense urban canyons. The good news is that bringing this tech to everyday smartwatches could also push manufacturers to adopt next-gen GNSS hardware and smarter positioning software. Interestingly, this isn’t the only leap in smartwatch GPS tech — a new app even lets wearables track location underwater. Long story short, the next generation of smartwatches isn’t just tracking better; it’s getting smarter about where it works.
