Garmin Forerunner 301 Owner's Manual - Page 52

APPENDIX > HEART RATE MONITOR INFORMATION Heart Rate Monitor Information What is pairing and how does it work? Pairing occurs automatically when you turn on the Forerunner and you are wearing the heart rate monitor. Pairing allows the Forerunner to receive reliable heart rate data from your heart rate monitor by means of a secure, digital signal. When you put on the heart rate monitor, it begins transmitting heart rate data plus a unique, randomlyselected code. When you turn on the Forerunner, it begins "listening" for data from the heart rate monitor. Once the Forerunner "hears" two or more transmissions of heart rate data that contain the same unique code, it pairs with the heart rate monitor, creating a unique wireless link. Once paired, the Forerunner will never receive conflicting signals from another heart rate monitor, so you can exercise in close proximity to other heart rate monitors without fear of interference. If the Forerunner loses your heart rate signal, the pairing process begins again automatically. Follow these steps to pair successfully with your heart rate monitor: • Position the heart rate monitor and establish a strong connection between it and your pulse. • Position the Forerunner within range of the heart rate monitor (90-110 cm or 35-43 in). • Stand at least six feet away from any other heart rate monitor (only while pairing). Interference Strong electromagnetic fields can interfere with communication between your heart rate monitor and your Forerunner. Common sources of interference include high voltage power lines, electric motors, computers, televisions, and mobile phones. Interference may cause your heart rate to appear unusually high, freeze, or disappear. Once you move away from the source of interference, your heart rate reading should return to normal. 48 Forerunner® 301 Owner's Manual