The Action button gives quick control over a variety of functions. It’s customizable and can control a workout, mark a Compass Waypoint, or begin a dive.
In this tutorial, you will learn how to:
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• Access Action Button settings
• Use Action Button
• Activate Siren
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ACCESS ACTION BUTTON: From the clock screen, press the Digital Crown/Home button. Navigate to and select the Settings app.
Scroll to and select Action Button.
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SET ACTION BUTTON: From the Action Button screen, select Choose Action. Select the desired option.
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To use the Action Button at any time, press the Action Button.
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To activate the siren, press and hold the Action Button.
Note: Siren is enabled by default. To disable Siren, from Action Button settings, select the  Hold to Turn On switch.