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Choose a function for the Action button on Apple Watch Ultra
As you set up Apple Watch Ultra, you’re asked to choose a function for the Action button. The choices include the following:
Action | Press | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Workout | First press: Open the Workout app or start a workout Second press: Dependent on chosen workout | ||||||||||
Stopwatch | First press: Start Second press: Mark lap | ||||||||||
Waypoint | Press: Drop a Compass Waypoint | ||||||||||
Backtrack | Press: Record your route | ||||||||||
Dive | Press: Start a dive | ||||||||||
Flashlight | First press: On Second press: Off | ||||||||||
Shortcut | Press: Start shortcut | ||||||||||
Some actions offer additional options when you press the Action and side buttons simultaneously. You can change the function of the Action button after setup. Open the Settings app 
on your Apple Watch, then tap Action Button. See Use the Action button on Apple Watch Ultra.