Putting On the Optional Heart Rate Monitor
The heart rate monitor may cause chafing when used for long periods of time. To alleviate this issue, apply an anti-friction lubricant or gel to the center of the module where it contacts your skin. Do not apply anti-friction gel or lubricant on the electrodes. Do not use gels or lubricants that contain sunscreen.
You should wear the heart rate monitor directly on your skin, just below your sternum. It should be snug enough to stay in place during your activity.
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Push one tab
of the strap through the slot 
in the heart rate monitor module.
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Wet the electrodes
on the back of the module to create a strong connection between your chest and the heart rate monitor module.
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Wrap the strap around your chest and attach it to the other side of the heart rate monitor module.
The Garmin® logo should be right-side up.
After you put on the heart rate monitor, it is active and sending data.