The Apple Watch Ultra 3 is a rugged smartwatch designed for extreme environments and high-performance athletics. It features a 49mm case available in Anchor Blue Ocean titanium, housing the largest screen ever seen on an Apple Watch with a 1Hz always-on refresh rate for constant visibility. This model is built for endurance, offering up to 42 hours of standard battery life, which can be extended to 72 hours when using Low Power Mode. Connectivity is a core strength, as the device supports 5G cellular and critical satellite features for Emergency SOS, messaging, and Find My when you are off the grid. For precise navigation, it utilizes high-accuracy dual-frequency GPS. The watch is rated WR100, meaning it can withstand depths of 100 meters and is suitable for recreational scuba diving down to 40 meters. Health and fitness tracking are deeply integrated, including a blood oxygen app, sleep scoring, and upcoming hypertension notifications. Athletes can benefit from the Apple Intelligence powered Workout Buddy, automatic track-running detection, and detailed swimming metrics like the SWOLF score and automatic stroke detection. To use these features, you will need an iPhone 11 or later running iOS 26, as the watch operates on watchOS 26.