GPS and a barometric altimeter track how far and high you go New dual-core processor for faster app performance Ultimate sports watch and intelligent activity tracker Swimproof so youre always ready for the pool or ocean Aluminum case watchOS 4 is even more intuitive and intelligent Nike Sport Band and Nike Sport Loop are lightweight and breathable Exclusive Nike watch faces Apple Watch Series 3 (GPS) requires an iPhone 5s or later with iOS 11 or later. Compared with the previous generation. ISO standard 22810:2010. Appropriate for shallow-water activities like swimming. Submersion below shallow depth and high-velocity water activities not recommended.