Google claims its Pixel Watch 5 delivers superior GPS accuracy compared to Apple and Garmin devices, so I took all three watches for a real-world test on the London Marathon route. The 26.2-mile course provided the perfect challenge to verify these bold assertions.
The test involved wearing each watch simultaneously while running the full marathon distance. Google's claims centered on improved GPS chip technology and software optimization in the Pixel Watch 5. Apple Watch and Garmin models represent the current market leaders in fitness tracking accuracy.
During the 26.2-mile run, each device recorded slightly different distances due to GPS signal variations. The Pixel Watch 5 showed impressive consistency in maintaining signal lock through tree cover and urban canyons. However, the differences between devices were measured in fractions of a mile rather than dramatic gaps.
Apple Watch maintained strong GPS performance throughout most of the route, with only minor deviations in areas with dense overhead coverage. Garmin's watch demonstrated reliable tracking but showed some variance in distance calculation compared to the official course measurement.
For casual runners, the small differences between these devices may not significantly impact training or race performance. Most users prioritize battery life, comfort, and additional features over marginal GPS improvements. However, serious athletes and marathon trainers might notice the cumulative effect of inaccurate distance tracking over many miles.
The Pixel Watch 5's GPS enhancements appear genuine but don't represent a revolutionary leap beyond what Apple and Garmin already offer. Each watch has strengths depending on specific use cases and user preferences.
What was the actual distance difference between the watches? The watches differed by less than 0.2 miles over the full marathon distance, with the Pixel Watch 5 recording closest to the official 26.2-mile measurement.
Do GPS accuracy improvements matter for most users? For everyday fitness tracking, the differences are minimal. Serious runners analyzing pace and distance data may benefit more from consistent accuracy.
Which watch offers the best overall GPS performance? All three watches performed well, with the Pixel Watch 5 showing slight advantages in signal retention, though Apple and Garmin remain highly competitive options.