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About sensors
Sensors are external devices which you can link to your watch to provide information about your
activity. Two types of sensors can be used with your watch:
External Heart rate monitor - this measures your heart rate as you train. The external TomTom
Heart Rate Monitor is included in some products and available as an accessory for others.
Cadence/Speed sensor - this measures your cadence and speed as you cycle. The TomTom
Cadence Sensor is included in some products and available as an accessory for others. TomTom
Runner does not support the Cadence Sensor.
Cadence
Cadence measures the rate at which you pedal in revolutions per minute (rpm). In a low gear, you may
have a very high cadence but a lower speed. In a high gear, you may have a low cadence but a higher
speed. Cyclists train to find the balance between cadence and speed which allows them to cycle as
efficiently as possible.
External Heart Rate Monitor
To use the external TomTom Heart Rate Monitor with your watch, do the following:
1. Attach the monitor to the strap.
2. Attach the strap around your chest, so the monitor sits just above the base of your chest bone.
Make sure the monitor is the right way up so that the word 'TomTom' is the right way up for
someone standing in front of you.
Tip: Wet the sensors on the inside of the strap before placing it around your chest. This makes it
easier for the monitor to pick up your heartbeat.
3. From the clock screen on your watch, move down.
4. Select Sensors then move right.
Adding sensors