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GPS watches are typically aimed at runners, swimmers, cyclists, and other types of athletes who need in-depth data to help them train optimally. It have basic features similar to fitness trackers, for example, they also track steps, sleep, and heart rate, but because using GPS tracking, It can provide more accurate pace and distance metrics. and provides maps, workout suggestions and training feedback. It's ypically more expensive and bulky than fitness trackers, but It also tend to be more durable and more accurate.
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