The Apple watch uses the built-in GPS to measure and record the exact distance, speed and pace while you were working out. It picks up a signal immediately so you don’t have to wait. After you return home, you can check your iPhone to see a map of your route and your top speed. The bight display of this watch enables you to see the metrics clearly even in sunny days. This Apple Watch allows you to leave your iPhone at home when you go for a run or ride. It even measures your workout accurately. This watch features a built-in GPS which tracks your movements and measures the distance you run. The water resistance allows you to do swim workouts or even play with your kids.