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• Use a Connect IQ watch face that is not updated every

second.

For example, use a watch face without a second hand

(Customizing the Watch Face, page

• Limit the smartphone notifications the device displays

(Managing Notifications, page

• Stop broadcasting heart rate data to paired Garmin devices

(Broadcasting Heart Rate Data to Garmin

• Turn off wrist-based heart rate monitoring

Wrist Heart Rate Monitor, page

NOTE: Wrist-based heart rate monitoring is used to calculate

vigorous intensity minutes and calories burned.

The temperature reading is not accurate

Your body temperature affects the temperature reading for the

internal temperature sensor. To get the most accurate

temperature reading, you should remove the watch from your

wrist and wait 20 to 30 minutes.

You can also use an optional tempe external temperature

sensor to view accurate ambient temperature readings while

wearing the watch.

How can I manually pair ANT+ sensors?

You can use the device settings to manually pair ANT+ sensors.

The first time you connect a sensor to your device using ANT+

wireless 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.

Stay 10 m (33 ft.) away from other ANT+ sensors while

pairing.

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.

Hold UP.

Select Settings > Sensors and Accessories > Add New.

Select an option:

• Select Search All.

• Select your sensor type.

After the sensor is paired with your device, a message

appears. Sensor data appears in the data page loop or a

custom data field.

Can I use my Bluetooth sensor with my

watch?

The device is compatible with some Bluetooth sensors. The first

time you connect a sensor to your Garmin device, 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.

Hold UP.

Select Settings > Sensors and Accessories > Add New.

Select an option:

• Select Search All.

• Select your sensor type.

You can customize the optional data fields

Data Screens, page

20).

My music cuts out or my headphones do not

stay connected

When using a Forerunner 645 Music device connected to

headphones using Bluetooth technology, the signal is strongest

Appendix

22).

1).

Devices, page

(Turning Off the

9).

(Customizing the

when there is a direct line of sight between the device and the

antenna on the headphones.

• If the signal passes through your body, you may experience

signal loss or your headphones may become disconnected.

• It is recommended to wear your headphones with the

antenna on the same side of your body as your

Forerunner 645 Music device.

9).

Data Fields

Some data fields require ANT+ accessories to display data.

%HRR: The percentage of heart rate reserve (maximum heart

rate minus resting heart rate).

24-Hour Max.: The maximum temperature recorded in the last

24 hours.

24-Hour Min.: The minimum temperature recorded in the last

24 hours.

Aerobic TE: The impact of the current activity on your aerobic

fitness level.

Anaerobic TE: The impact of the current activity on your

anaerobic fitness level.

Average HR: The average heart rate for the current activity.

Average Pace: The average pace for the current activity.

Average Swolf: The average swolf score for the current activity.

Your swolf score is the sum of the time for one length plus

the number of strokes for that length

page

3). In open water swimming, 25 meters is used to

calculate your swolf score.

Avg. %HRR: The average percentage of heart rate reserve

(maximum heart rate minus resting heart rate) for the current

activity.

Avg. Ascent: The average vertical distance of ascent since the

last reset.

Avg. Cadence: Running. The average cadence for the current

activity.

Avg. Cadence: Cycling. The average cadence for the current

activity.

Avg. Descent: The average vertical distance of descent since

the last reset.

Avg. GCT Bal.: The average ground contact time balance for

the current session.

Avg. Lap Time: The average lap time for the current activity.

Avg. Speed: The average speed for the current activity.

Avg. Stride Len.: The average stride length for the current

session.

Avg. Strk/Len: The average number of strokes per pool length

during the current activity.

Avg. Vert. Osc.: The average amount of vertical oscillation for

the current activity.

Avg. Vert. Ratio: The average ratio of vertical oscillation to

stride length for the current session.

Avg GCT: The average amount of ground contact time for the

current activity.

Avg HR %Max.: The average percentage of maximum heart

rate for the current activity.

Battery Level: The remaining battery power.

Bearing: The direction from your current location to a

destination. You must be navigating for this data to appear.

Cadence: Running. The steps per minute (right and left).

Appendix

(Swim Terminology,