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Forerunner
®
205/305 Owner’s Manual 59
appendIx
heart rate zones based on the
percentages shown below. For
more information on setting your
heart rate zones, see page 51.
About Pairing
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
Accessories,” page 46). Each
sensor has a unique ID. The
Forerunner learns and saves this
unique ID while pairing the rst
time. The next time you turn on
the Forerunner, it will only pair
with the unique sensor ID. If the
Forerunner does not nd the
sensor, you should restart the
scan to nd your sensor ID.
Interference
Strong electromagnetic elds
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.