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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.
1
Hold UP.
2
Select Settings > Sensors & Accessories > Add New.
3
Select an option:
• Select Search All.
• Select your sensor type.
You can customize the optional data fields (Customizing the
Data Screens, page 22).
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
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.
Appendix
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 (Swim Terminology,
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).
Cadence: Cycling. The number of revolutions of the crank arm.
Your device must be connected to a cadence accessory for
this data to appear.
Calories: The amount of total calories burned.
Compass Hdg.: The direction you are moving based on the
compass.
Course: The direction from your starting location to a
destination. Course can be viewed as a planned or set route.
You must be navigating for this data to appear.
Dest. Location: The position of your final destination.
Dest. Wpt: The last point on the route to the destination. You
must be navigating for this data to appear.
Dist. Remaining: The remaining distance to the final
destination. You must be navigating for this data to appear.
Distance: The distance traveled for the current track or activity.
Distance To Next: The remaining distance to the next waypoint
on the route. You must be navigating for this data to appear.
Elapsed Time: The total time recorded. For example, if you start
the timer and run for 10 minutes, then stop the timer for 5
minutes, then start the timer and run for 20 minutes, your
elapsed time is 35 minutes.
Elevation: The altitude of your current location above or below
sea level.
Estimated Total Distance: The estimated distance from the
start to the final destination. You must be navigating for this
data to appear.
ETA: The estimated time of day when you will reach the final
destination (adjusted to the local time of the destination). You
must be navigating for this data to appear.
ETA at Next: The estimated time of day when you will reach the
next waypoint on the route (adjusted to the local time of the
waypoint). You must be navigating for this data to appear.
ETE: The estimated time remaining until you reach the final
destination. You must be navigating for this data to appear.
GCT: The amount of time in each step that you spend on the
ground while running, measured in milliseconds. Ground
contact time is not calculated while walking.
GCT Balance: The left/right balance of ground contact time
while running.
Glide Ratio: The ratio of horizontal distance traveled to the
change in vertical distance.
Glide Ratio Dest.: The glide ratio required to descend from your
current position to the destination elevation. You must be
navigating for this data to appear.
GPS: The strength of the GPS satellite signal.
GPS Elevation: The altitude of your current location using GPS.
Appendix 29
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