The heart rate monitor records and stores your heart rate data while swimming. Heart rate data is not transmitted to paired Garmin^® devices while the heart rate monitor is underwater.

You should ensure the heart rate monitor is snug when using it for swimming. Movement of the heart rate monitor on your chest can affect the accuracy of the heart rate measurements. For pool swimming, the heart rate monitor should be worn under a swim suit or triathlon top. Otherwise, it may slide down your chest when pushing off the pool wall.

You must start a timed activity on your paired Garmin device to view stored heart rate data later. During rest intervals when out of the water, the heart rate monitor sends your average and maximum heart rate for the previous interval, and your real-time heart rate, to your Garmin device.