How does the Apple Watch Ultra 2's GPS accuracy compare to other models

General GPS Performance
The Apple Watch Ultra 2 generally delivers excellent GPS accuracy in open areas. It utilizes a dual-frequency, multi-constellation GNSS chipset, which allows it to maintain a strong satellite connection and filter out unreliable signals. This capability is particularly beneficial in environments with a clear view of the sky, where the watch performs comparably to leading competitors like the Garmin Forerunner 965 and Suunto Vertical[1][2].

Challenges in Urban and Wooded Areas
Despite its advanced features, the Ultra 2 struggles in specific challenging environments, such as near tall buildings or dense tree cover. In these situations, its accuracy can be compromised. For instance, during tests conducted near urban structures, the Ultra 2 exhibited inaccuracies that were more pronounced than those seen with the Suunto Vertical, which performed better under similar conditions[1]. In wooded areas, while it maintained decent accuracy, it was often on par with or slightly less accurate than the Garmin Forerunner 965[1].

Comparative Accuracy
In direct comparisons with other models like the Garmin Epix Pro and Forerunner 265, the Ultra 2 showed mixed results. For example, during a 50-mile ultra marathon test, the Ultra 2 initially recorded a distance that was off by approximately 0.4 miles compared to the Garmin but stabilized over time[2]. Another test involving an 8,000-step walk showed both watches recording similar distances, indicating that in less demanding conditions, the Ultra 2 performs competitively[5]. However, during a half marathon event, it recorded a longer distance than the official race length, suggesting that it may overestimate distances when navigating tight turns or crowded courses[6].

Overall, while the Apple Watch Ultra 2 offers significant improvements in GPS technology compared to earlier models and performs well in many scenarios, it still faces challenges in urban environments and under dense foliage when compared to specialized devices from brands like Garmin and Suunto.