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Predicted race times: Your device uses the VO2 max. estimate
and published data sources to provide a target race time
based on your current state of fitness. This projection also
presumes you have completed the proper training for the
race.
HRV stress test: The HRV (heart rate variability) stress test
requires a Garmin chest heart rate monitor. The device
records your heart rate variability while standing still for 3
minutes. It provides your overall stress level. The scale is 1 to
100, and a lower score indicates a lower stress level.
Performance condition: Your performance condition is a real-
time assessment after 6 to 20 minutes of activity. It can be
added as a data field so you can view your performance
condition during the rest of your activity. It compares your
real-time condition to your average fitness level.
Functional threshold power (FTP): The device uses your user
profile information from the initial setup to estimate your FTP.
For a more accurate rating, you can conduct a guided test.
Lactate threshold: Lactate threshold requires a chest heart rate
monitor. Lactate threshold is the point where your muscles
start to rapidly fatigue. Your device measures your lactate
threshold level using heart rate data and pace.
Turning Off Performance Notifications
Performance notifications are turned on by default. Some
performance notifications are alerts that appear upon completion
of your activity. Some performance notifications appear during
an activity or when you achieve a new performance
measurement, such as a new VO2 max. estimate.
1
Hold MENU.
2
Select Settings > Physiological Metrics > Performance
Notifications.
3
Select an option.
Detecting Performance Measurements Automatically
The Auto Detection feature is turned on by default. The device
can automatically detect your maximum heart rate, and lactate
threshold during an activity. When paired with a compatible
power meter, the device can automatically detect your functional
threshold power (FTP) during an activity.
NOTE: The device detects a maximum heart rate only when
your heart rate is higher than the value set in your user profile.
1
Hold MENU.
2
Select Settings > Physiological Metrics > Auto Detection.
3
Select an option.
Syncing Activities and Performance Measurements
You can sync activities and performance measurements from
other Garmin devices to your tactix Charlie device using your
Garmin Connect account. This allows your device to more
accurately reflect your training status and fitness. For example,
you can record a ride with an Edge device, and view your
activity details and overall training load on your tactix Charlie
device.
1
Hold MENU.
2
Select Settings > Physiological Metrics > TrueUp.
When you sync your device with your smartphone, recent
activities and performance measurements from your other
Garmin devices appear on your tactix Charlie device.
Training Status
Training status shows you how your training affects your fitness
level and performance. Your training status is based on changes
to your training load and VO2 max. over an extended time
period. You can use your training status to help plan future
training and continue improving your fitness level.
Peaking: Peaking means that you are in ideal race condition.
Your recently reduced training load is allowing your body to
recover and fully compensate for earlier training. You should
plan ahead, since this peak state can only be maintained for
a short time.
Productive: Your current training load is moving your fitness
level and performance in the right direction. You should plan
recovery periods into your training to maintain your fitness
level.
Maintaining: Your current training load is enough to maintain
your fitness level. To see improvement, try adding more
variety to your workouts or increasing your training volume.
Recovery: Your lighter training load is allowing your body to
recover, which is essential during extended periods of hard
training. You can return to a higher training load when you
feel ready.
Unproductive: Your training load is at a good level, but your
fitness is decreasing. Your body may be struggling to
recover, so you should pay attention to your overall health
including stress, nutrition, and rest.
Detraining: Detraining occurs when you are training much less
than usual for a week or more, and it is affecting your fitness
level. You can try increasing your training load to see
improvement.
Overreaching: Your training load is very high and
counterproductive. Your body needs a rest. You should give
yourself time to recover by adding lighter training to your
schedule.
No Status: The device needs one or two weeks of training
history, including activities with VO2 max. results from
running or cycling, to determine your training status.
Tips for Getting Your Training Status
The training status feature depends on updated assessments of
your fitness level, including at least two VO2 max.
measurements per week. Your VO2 max. estimate is updated
after outdoor runs or rides during which your heart rate reached
at least 70% of your maximum heart rate for several minutes.
The trail run and indoor run activities do not generate a VO2
max. estimate in order to preserve the accuracy of your fitness
level trend.
To get the most out of the training status feature, you can try
these tips.
• At least two times per week, run or ride outdoors with a
power meter, and reach a heart rate higher than 70% of your
maximum heart rate for at least 10 minutes.
After using the device for one week, your training status
should be available.
• Record all of your fitness activities on this device, or enable
the Physio TrueUp
™
feature, allowing your device to learn
about your performance (Syncing Activities and Performance
Measurements, page 12).
About VO2 Max. Estimates
VO2 max. is the maximum volume of oxygen (in milliliters) you
can consume per minute per kilogram of body weight at your
maximum performance. In simple terms, VO2 max. is an
indication of athletic performance and should increase as your
level of fitness improves. The tactix Charlie device requires
wrist-based heart rate or a compatible chest heart rate monitor
to display your VO2 max. estimate. The device has separate
VO2 max. estimates for running and cycling. You must run
either outside with GPS or ride with a compatible power meter at
a moderate level of intensity for several minutes to get an
accurate VO2 max. estimate.
On the device, your VO2 max. estimate appears as a number,
description, and position on the color gauge. On your Garmin
Connect account, you can view additional details about your
VO2 max. estimate, including your fitness age. Your fitness age
gives you an idea of how your fitness compares with a person of
12 Heart Rate Features
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