From the clock, select START. Select an activity. If necessary, follow the on-screen instructions to enter additional information. If necessary, wait while the device connects to your ANT+® sensors. If the activity requires GPS, go outside, and wait while the device locates satellites. Select START to start the timer.
Activity tracking can be enabled during the initial device setup, or at any time. NOTE: Turning on activity tracking can decrease the battery life between charges. Hold UP. Select Settings > Activity Tracking > Status > On. Your step count does not appear until the device locates satellites and sets the time automatically.
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garmin fenix 3 hr battery life
