Apple watch ultra

Introducing a watch that pushes boundaries. Introducing Apple Watch Ultra
The most rugged and capable Apple Watch ever, designed for exploration, adventure, and endurance. With a 49mm aerospace-grade titanium case, extra-long battery life,¹ specialised apps that work with the advanced sensors, and a new customisable Action button.
The largest, brightest Apple Watch display for improved legibility in all conditions
Direct Sunlight is no obstacle for the Always-On Retina display that's an eye-opening 2000 nits at it's peak and twice as bright as any other Apple Watch. And the bigger display provides more room for workout metrics and detail-packed watch faces.
Up to 36 hours of battery life for normal use along with low-power settings for even longer battery life¹
With longer battery life than ever, you can take on almost anything and have energy to spare.¹ Up to 36hrs of normal use¹ Up to 60hrs on low power settings
Precision dual-frequency GPS system provides accurate location for calculating distance, pace, and route maps
For most people, a traditional GPS solution with just L1 GPS works well most of the time. But it can be tricky when tall buildings, trees, or dense foliage block satellites. The newer L5 GPS enables advanced signal processing, reducing many errors and providing a more consistent signal in environments like dense cities. Two frequencies. One precise solution. Apple Watch Ultra integrates both L1 and L5 GPS into a new antenna design for greater range with incredible power efficiency. It combines data from these two frequencies to provide amazingly accurate distance, pace, and route calculations.
The most accurate GPS in dense urban environments.
The dual-frequency system combines with Apple Maps to include road, bike, and trail routes that better identify actual locations. Accuracy is boosted by new satellite and signal models. And a custom, advanced algorithm makes optimal use of available satellite signals.
Water resistant 100m²
Greater operating temperature tolerances while on-wrist to accommodate incredibly diverse environments. Advanced safety features, including Siren, Backtrack, Fall Detection, Emergency SOS,3 and Crash Detection 
Introducing Crash Detection.
New sensors and a machine learning algorithm work to detect severe car crashes and automatically contact emergency services. Apple Watch Ultra also provides your location to dispatchers and notifies your emergency contacts.
Fall Detection.
Whether you’re at home or out adventuring, if a fall is detected and you’re unresponsive, a call to emergency services will be placed automatically. 
Emergency SOS.
Press and hold the side button to quickly contact emergency services and provide them with your location. For a period of time, your emergency contacts will get updates when your location changes. Customizable Action button can mark a Compass Waypoint, start Backtrack, mark segments in a workout, turn on the flashlight, and more
A completely redesigned Compass app with waypoints and Backtrack
An accurate compass is as crucial for navigating the wild as a solid pair of boots. The redesigned Compass app delivers allnew views and functionality that take wristdriven orienteering to new heights.
Action button. Make your mark. Find your way.
A single press of the Action button can quickly drop a Compass Waypoint at your location or immediately start Backtrack, so you can focus on the journey ahead or behind you.