Synthetic fabrics that rub or flap against the heart rate monitor can create static electricity that interferes with heart rate signals.

•Move away from sources of strong electromagnetic fields and some 2.4 GHz wireless sensors, which can interfere with your heart rate monitor. Sources of interference may include very high voltage power lines, electric motors, microwave ovens,

2.4 GHz cordless phones, and wireless LAN access points.

Heart Rate Zones

Caution: Consult your physician to specify heart rate zones/targets that are appropriate for your fitness level and health condition.

Using Accessories

Many athletes are using heart rate zones to measure and increase their cardiovascular strength and improve their level of fitness. A heart rate zone is a set range of heartbeats per minute. The five commonly accepted heart rate zones are numbered from 1–5 according to increasing intensity. The Forerunner sets the heart rate zone ranges based on your maximum heart rate (see the table on page 43) and resting heart rate set in your user profile.

You can also customize your heart rate zones in your user profile of Garmin Connect or Garmin Training Center. After customizing your heart rate zones, transfer data to your Forerunner.

Forerunner 405 Owner’s Manual