Forerunner ® 205/305 Owner’s Manual 3GettInG StartedUsing the Heart Rate MonitorNote: The heart rate montor works wth the Forerunner 305 only.Wear the heart rate monitor directly on your skin, just below yourbreastplate. It should be snug enough to stay in place during your run.To position the heart rate monitor:1. Push one tab on the strap through the slot in the heart rate monitor.Press the tab down.sensors2. Wet both sensors on the back of the heart rate monitor to create astrong connection between your pulse and the transmitter.