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Garmin Forerunner 645 Manual

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Wireless Sensors
Your device can be used with wireless ANT+ or Bluetooth
sensors. For more information about compatibility and
purchasing optional sensors, go to buy.garmin.com.
Pairing Your Wireless Sensors
The first time you connect a wireless sensor to your device
using ANT+ or Bluetooth technology, you must pair the device
and sensor. After they are paired, the device connects to the
sensor automatically when you start an activity and the sensor is
active and within range.
1
If you are pairing a heart rate monitor, put on the heart rate
monitor.
The heart rate monitor does not send or receive data until
you put it on.
2
Bring the device within 3 m (10 ft.) of the sensor.
NOTE: Stay 10 m (33 ft.) away from other wireless sensors
while pairing.
3
Hold UP.
4
Select Settings > Sensors & Accessories > Add New.
5
Select an option:
• Select Search All.
• Select your sensor type.
After the sensor is paired with your device, the sensor status
changes from Searching to Connected. Sensor data appears
in the data screen loop or a custom data field.
Foot Pod
Your device is compatible with the foot pod. You can use the
foot pod to record pace and distance instead of using GPS when
you are training indoors or when your GPS signal is weak. The
foot pod is on standby and ready to send data (like the heart
rate monitor).
After 30 minutes of inactivity, the foot pod powers off to
conserve the battery. When the battery is low, a message
appears on your device. Approximately five hours of battery life
remain.
Going for a Run Using a Foot Pod
Before you go for a run, you must pair the foot pod with your
Forerunner device (Pairing Your Wireless Sensors, page 20).
You can run indoors using a foot pod to record pace, distance,
and cadence. You can also run outdoors using a foot pod to
record cadence data with your GPS pace and distance.
1
Install your foot pod according to the accessory instructions.
2
Select a running activity.
3
Go for a run.
Foot Pod Calibration
The foot pod is self-calibrating. The accuracy of the speed and
distance data improves after a few outdoor runs using GPS.
Improving Foot Pod Calibration
Before you can calibrate your device, you must acquire GPS
signals and pair your device with the foot pod (Pairing Your
Wireless Sensors, page 20).
The foot pod is self-calibrating, but you can improve the
accuracy of the speed and distance data with a few outdoor runs
using GPS.
1
Stand outside for 5 minutes with a clear view of the sky.
2
Start a running activity.
3
Run on a track without stopping for 10 minutes.
4
Stop your activity, and save it.
Based on the recorded data, the foot pod calibration value
changes, if necessary. You should not need to calibrate the
foot pod again unless your running style changes.
Calibrating Your Foot Pod Manually
Before you can calibrate your device, you must pair your device
with the foot pod sensor (Pairing Your Wireless Sensors,
page 20).
Manual calibration is recommended if you know your calibration
factor. If you have calibrated a foot pod with another Garmin
product, you may know your calibration factor.
1
Hold UP.
2
Select Settings > Sensors & Accessories.
3
Select your foot pod.
4
Select Cal. Factor > Set Value.
5
Adjust the calibration factor:
• Increase the calibration factor if your distance is too low.
• Decrease the calibration factor if your distance is too high.
Setting Foot Pod Speed and Distance
Before you can customize the foot pod speed and distance, you
must pair your device with the foot pod sensor (Pairing Your
Wireless Sensors, page 20).
You can set your device to calculate speed and distance using
your foot pod data instead of GPS data.
1
Hold UP.
2
Select Settings > Sensors & Accessories.
3
Select your foot pod.
4
Select Speed or Distance.
5
Select an option:
• Select Indoor when you are training with GPS turned off,
usually indoors.
• Select Always to use your foot pod data regardless of the
GPS setting.
Extended Display Mode
You can use Extended Display mode to display data screens
from your Forerunner device on a compatible Edge device
during a ride or triathlon. See your Edge owner's manual for
more information.
Using an Optional Bike Speed or Cadence
Sensor
You can use a compatible bike speed or cadence sensor to
send data to your device.
• Pair the sensor with your device (Pairing Your Wireless
Sensors, page 20).
• Set your wheel size (Wheel Size and Circumference,
page 30).
• Go for a ride (Starting an Activity, page 2).
Situational Awareness
Your Forerunner device can be used with the Varia Vision
™
device, Varia
™
smart bike lights, and rearview radar to improve
situational awareness. See the owner's manual for your Varia
device for more information.
NOTE: You may need to update the Forerunner software before
pairing Varia devices (Updating the Software Using Garmin
Express, page 27).
tempe
The tempe is an ANT+ wireless temperature sensor. You can
attach the sensor to a secure strap or loop where it is exposed
to ambient air, and therefore, provides a consistent source of
20 Wireless Sensors
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