Garmin 305 Owner's Manual

A

PPENDIX

Pairing is the process of matching 

sensors, like your heart rate 

monitor, with your Forerunner 

305. This process occurs 

automatically when you turn on 

the Forerunner and only takes a 

few seconds when the sensors 

are on and functioning correctly.
Once paired, your Forerunner 

will only receive data from your 

sensor. Upon power up, the 

Forerunner will automatically 

scan for the sensors you 

have enabled (see “Adding 

Each 

sensor has a unique ID. The 

Forerunner learns and saves this 

unique ID while pairing the first 

time. The next time you turn on 

the Forerunner, it will only pair 

with the unique sensor ID. If the 

Forerunner does not find the 

sensor, you should restart the 

scan to find your sensor ID.

Strong electromagnetic fields 

can interfere with your heart rate 

monitor and cause your heart 

rate to appear unusually high, 

freeze, or disappear. Common 

sources of interference include 

high voltage power lines, electric 

motors, computers, televisions, 

and mobile phones. After you 

move away from the source of 

interference, your heart rate 

reading should return to normal.