Garmin D2 AIR X10 User manual

D2™AIR X10
Owner’s Manual

© 2022 Garmin Ltd. or its subsidiaries
All rights reserved. Under the copyright laws, this manual may not be copied, in whole or in part, without the written consent of Garmin. Garmin reserves the right to change or improve its products
and to make changes in the content of this manual without obligation to notify any person or organization of such changes or improvements. Go to www.garmin.com for current updates and
supplemental information concerning the use of this product.
Garmin®, the Garmin logo, ANT+®, Approach®, Auto Lap®, Auto Pause®, and Edge® are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. Body Battery™,
Connect IQ™, D2™, Firstbeat Analytics™, Garmin AutoShot™, Garmin Connect™, Garmin Express™, Garmin Golf™, Garmin Index™, Garmin Move IQ™, Garmin Pay™, Garmin Pilot™, Health
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This product is ANT+® certified. Visit www.thisisant.com/directory for a list of compatible products and apps.
M/N: A04125

Table of Contents
Introduction.......................................... 1
Overview........................................................ 1
Default Watch Face.................................. 1
Touchscreen Tips......................................... 1
Locking and Unlocking the
Touchscreen............................................. 1
Icons.............................................................. 1
Setting Up Your Watch................................. 2
Flying................................................... 2
Aviation Settings...........................................2
Setting the Altitude Alert.......................... 2
Setting the Low Oxygen Alert................... 2
Setting the Barometric Pressure..............2
Setting the Fuel Tank Reminder............... 2
Selecting a Favorite Airport...................... 2
Flying Activity................................................ 2
Setting the Auto Fly Value........................ 3
Starting a Flight......................................... 3
Viewing Your SpO2 Readings in Flight.... 3
Navigating to the Nearest Airport............ 3
Nearest Airports.................................... 3
Navigating to an Aviation Waypoint by Its
Identifier.................................................... 3
Navigating Directly to a Saved
Location..................................................... 3
Horizontal Situation Indicator.................. 3
Stopping Navigation................................. 4
Disabling the Automatic Flight Timer...... 4
Flight Plans................................................... 4
Finding a Waypoint................................... 4
Sending a Flight Plan to Your Watch....... 4
Following a Flight Plan............................. 4
Smart Features..................................... 4
Pairing Your Phone....................................... 4
Connected Features..................................... 4
Phone Notifications.................................. 5
Enabling Bluetooth Notifications......... 5
Viewing Notifications............................5
Replying with a Customized Text
Message................................................ 5
Calling from the Watch......................... 5
Receiving an Incoming Phone Call...... 5
Managing Notifications........................ 5
Turning Off the Bluetooth Phone
Connection............................................ 6
Using the Voice Assistant........................ 6
Using Do Not Disturb Mode..................... 6
Finding Your Phone.................................. 6
Connecting to the Garmin Pilot App............ 6
Updating the Aviation Database.................. 6
Connect IQ Features..................................... 6
Downloading Connect IQ Features.......... 7
Downloading Connect IQ Features Using
Your Computer.......................................... 7
Wi‑Fi Connected Features............................ 7
Connecting to a Wi‑Fi Network................ 7
Controls................................................7
Customizing the Controls Menu.................. 8
Music................................................... 8
Downloading Personal Audio Content........ 8
Connecting to a Third-Party Provider.......... 8
Downloading Audio Content from a Third-
Party Provider............................................9
Disconnecting from a Third-Party
Provider..................................................... 9
Connecting Bluetooth Headphones............ 9
Listening to Music........................................ 9
Music Playback Controls............................. 9
Garmin Pay........................................... 9
Setting Up Your Garmin Pay Wallet............. 9
Paying for a Purchase Using Your
Watch.......................................................... 10
Adding a Card to Your Garmin Pay
Wallet.......................................................... 10
Managing Your Garmin Pay Cards........ 10
Changing Your Garmin Pay Passcode...... 10
Safety and Tracking Features............. 10
Adding Emergency Contacts..................... 10
Adding Contacts......................................... 11
Incident Detection...................................... 11
Turning Incident Detection On and Off..11
Requesting Assistance.............................. 11
Heart Rate Features............................ 11
Wrist-based Heart Rate.............................. 11
Wearing the Watch................................. 11
Tips for Erratic Heart Rate Data.............12
Viewing Heart Rate Information............ 12
Setting an Abnormal Heart Rate Alert... 12
Broadcasting Heart Rate........................ 12
Table of Contents i

Turning Off the Wrist-based Heart Rate
Monitor.................................................... 12
About Heart Rate Zones.............................12
Setting Your Heart Rate Zones.............. 13
Fitness Goals.......................................... 13
Heart Rate Zone Calculations................ 13
About VO2 Max. Estimates........................ 13
Getting Your VO2 Max. Estimate........... 13
Viewing Your Fitness Age.......................... 13
Pulse Oximeter........................................... 14
Getting Pulse Oximeter Readings.......... 14
Changing the Pulse Oximeter Tracking
Mode........................................................14
Tips for Erratic Pulse Oximeter Data..... 14
Activity Tracking................................ 14
Auto Goal.................................................... 14
Using the Move Alert.................................. 14
Sleep Tracking............................................ 15
Intensity Minutes........................................ 15
Earning Intensity Minutes.......................15
Garmin Move IQ™....................................... 15
Activity Tracking Settings.......................... 15
Turning Off Activity Tracking................. 15
Glances.............................................. 15
Viewing Glances......................................... 16
Customizing the Glances....................... 16
Viewing the Waypoints Glance.................. 17
METAR........................................................ 17
Altimeter......................................................17
Adding Alternate Time Zones.................... 17
Heart Rate Variability and Stress Level..... 17
Using the Stress Level Glance............... 18
Body Battery................................................18
Viewing the Body Battery Glance...........18
Tips for Improved Body Battery Data.... 18
Women's Health......................................... 18
Menstrual Cycle Tracking...................... 18
Logging Your Menstrual Cycle
Information.......................................... 18
Pregnancy Tracking................................ 18
Logging Your Pregnancy
Information.......................................... 19
Hydration Tracking..................................... 19
Using the Hydration Tracking Glance.... 19
Apps and Activities............................. 19
Starting an Activity..................................... 19
Tips for Recording Activities.................. 19
Stopping an Activity................................... 20
Adding a Custom Activity...........................20
Adding or Removing a Favorite Activity.... 20
Health Snapshot......................................... 20
Indoor Activities.......................................... 20
Recording a Strength Training Activity.. 20
Recording a HIIT Activity........................ 20
Calibrating the Treadmill Distance........ 21
Outdoor Activities....................................... 21
Going for a Run....................................... 21
Going for a Ride...................................... 21
Viewing Your Ski Runs............................21
Going for a Pool Swim............................... 21
Setting the Pool Size.............................. 22
Swim Terminology.................................. 22
Golfing......................................................... 22
Downloading Golf Courses.................... 22
Playing Golf............................................. 22
Hole Information..................................... 22
Changing the Pin Location................. 22
Viewing the Direction to the Pin......... 22
Viewing Layup and Dogleg Distances... 22
Viewing Hazards..................................... 23
Measuring a Shot with Garmin
AutoShot™............................................... 23
Keeping Score......................................... 23
Setting the Scoring Method................23
Tracking Golf Statistics...................... 23
Recording Golf Statistics....................23
Viewing Your Shot History..................... 24
Viewing Your Round Summary.............. 24
Ending a Round....................................... 24
Garmin Golf App..................................... 24
Training.............................................. 24
Setting Up Your User Profile...................... 24
Workouts..................................................... 24
Starting a Workout.................................. 24
Using Garmin Connect Training Plans.. 24
Adaptive Training Plans..................... 24
Starting Today's Workout................... 24
Viewing Scheduled Workouts............ 25
Personal Records....................................... 25
Viewing Your Personal Records............ 25
Restoring a Personal Record................. 25
Clearing Personal Records.....................25
Navigation.......................................... 25
ii Table of Contents

Saving Your Location................................. 25
Deleting a Location................................. 25
Navigating to a Saved Location.................25
Navigating Back to Start............................ 25
Stopping Navigation................................... 26
Compass..................................................... 26
Calibrating the Compass Manually....... 26
History................................................26
Using History.............................................. 26
Viewing Your Time in Each Heart Rate
Zone......................................................... 26
Garmin Connect.......................................... 26
Using the Garmin Connect App............. 27
Using Garmin Connect on Your
Computer................................................ 27
Customizing Your Watch.....................27
Changing the Watch Face.......................... 27
Creating a Custom Watch Face............. 27
Editing a Watch Face.............................. 27
Setting Up a Shortcut Control.................... 28
Activities and App Settings........................ 28
Customizing the Data Screens.............. 28
Alerts....................................................... 28
Setting an Alert....................................29
Altimeter Readings................................. 29
Auto Lap.................................................. 29
Marking Laps Using the Auto
Lap Feature......................................... 29
Using Auto Pause®................................ 30
Using Auto Scroll.................................... 30
Changing the GPS Setting...................... 30
Phone and Bluetooth Settings................... 30
Battery Manager......................................... 30
System Settings..........................................30
Time Settings.......................................... 31
Time Zones......................................... 31
Setting an Alarm................................. 31
Deleting an Alarm............................... 31
Starting the Countdown Timer........... 31
Using the Stopwatch...........................31
Sound Settings........................................ 31
Customizing the Display Settings..........31
Changing the Units of Measure............. 32
Garmin Connect Settings........................... 32
Wireless Sensors................................ 32
Pairing Your Wireless Sensors.................. 32
Using an Optional Bike Speed or Cadence
Sensor......................................................... 32
Calibrating Your Speed Sensor.............. 32
Club Sensors............................................... 32
Situational Awareness............................... 32
tempe.......................................................... 32
Device Information............................. 32
About the AMOLED Display....................... 32
Charging the Device................................... 33
Product Updates......................................... 33
Updating the Software Using the Garmin
Connect App........................................... 33
Updating the Software Using Garmin
Express.................................................... 33
Viewing Device Information....................... 33
Viewing E-label Regulatory and
Compliance Information........................ 33
Specifications............................................. 33
Battery Life Information......................... 33
Device Care................................................. 34
Cleaning the Watch.................................34
Changing the Bands................................... 34
Troubleshooting................................. 34
Is my phone compatible with my
watch?......................................................... 34
My phone will not connect to the watch... 34
My headphones will not connect to the
watch........................................................... 34
My music cuts out or my headphones do
not stay connected..................................... 35
My watch is in the wrong language........... 35
My watch does not display the correct
time..............................................................35
Maximizing Battery Life............................. 35
Restarting the Watch.................................. 35
Restoring All Default Settings.................... 35
Acquiring Satellite Signals......................... 35
Improving GPS Satellite Reception........ 36
Activity Tracking......................................... 36
My step count does not seem
accurate.................................................. 36
The floors climbed amount does not
seem accurate........................................ 36
Getting More Information.......................... 36
Appendix............................................ 36
Data Fields.................................................. 36
VO2 Max. Standard Ratings....................... 38
Table of Contents iii

Wheel Size and Circumference..................38
Symbol Definitions..................................... 39
Index.................................................. 40
iv Table of Contents

Introduction
WARNING
See the Important Safety and Product Information guide in
the product box for product warnings and other important
information.
Always consult your physician before you begin or modify
any exercise program.
This device is not intended to provide primary flight
information, and is to be used for backup purposes only.
Overview
Action button: Hold for 2 seconds to turn on the watch.
Press to start and stop the activity timer.
Hold for 2 seconds to view the controls menu, including
power.
Hold until the watch vibrates 3 times to request
assistance (Safety and Tracking Features, page 10).
Back button: Press to return to the previous screen,
except during an activity.
During an activity, press to mark a new lap, start a new
set or pose, or advance to the next stage of a workout.
Hold to view a menu of watch settings and options for
the current screen.
Custom/Voice Assistant button: Press to view the
custom shortcut feature.
Hold to activate the voice assistant on your phone.
Touchscreen: Swipe up or down to scroll through
glances, features, and menus.
Tap to select.
Double-tap to wake the watch.
Swipe right to return to the previous screen.
During an activity, swipe right to view the watch face
and glances.
Default Watch Face
Weather conditions at the selected airport (Editing a
Watch Face, page 27).
Cloud coverage and visibility at the selected airport.
Wind conditions at the selected airport.
Coordinated Universal Time (UTC) pointer. Refer
ences the 24-hour time markings on the watch.
Touchscreen Tips
• Drag up or down to scroll through lists and menus.
• Swipe up or down to scroll quickly.
• Tap to select an item.
• From the watch face, swipe up or down to scroll
through the glances on the watch.
• Tap a glance to view additional information, if available.
• During an activity, swipe up or down to view the next
data screen.
• During an activity, swipe right to view the watch face
and glances, and swipe left to return to the activity data
fields.
• When available, select or swipe up to view
additional menu options.
• Perform each menu selection as a separate action.
Locking and Unlocking the Touchscreen
You can lock the touchscreen to prevent inadvertent
screen touches.
1Hold to view the controls menu.
2Select .
The touchscreen locks and does not respond to
touches until you unlock it.
3Hold any button to unlock the touchscreen.
Icons
A flashing icon means the watch is searching for a signal.
A solid icon means the signal was found or the sensor is
connected. A slash through an icon means the feature is
turned off.
Phone connection status
Heart rate monitor status
LiveTrack status
Speed and cadence sensor status
Varia™ bike light status
Introduction 1

Varia bike radar status
tempe™ sensor status
Setting Up Your Watch
To take full advantage of the D2 Air X10 features,
complete these tasks.
• Pair the watch with your phone using the Garmin
Connect™ app (Pairing Your Phone, page 4).
• Select your favorite airport (Selecting a Favorite Airport,
page 2).
• Set up Wi‑Fi® networks (Connecting to a Wi‑Fi Network,
page 7).
• Set up music (Music, page 8).
• Set up your Garmin Pay™ wallet (Setting Up Your
Garmin Pay Wallet, page 9).
• Set up safety features (Safety and Tracking Features,
page 10).
• Go to garmin.com/voicefunctionality/tips for tips about
using the voice assistant.
Flying
WARNING
Do not use this watch as a primary means of navigation.
See the Important Safety and Product Information guide in
the product box for product warnings and other important
information prior to use.
Aviation Settings
Hold , and select > Aviation.
Aviation Units: Sets the units of measure used for aviation
data.
Altimeter Settings & Alerts: Allows you to configure the
barometric altimeter and alert settings.
Fuel Tank Reminder: Sets an alarm to sound after a
specific number of minutes and displays a message to
check the fuel tank gauges.
Favorite Airport: Allows you view waypoint and METAR
information for your favorite airport on the default
watch face and aviation glances.
Setting the Altitude Alert
You can set an alarm to vibrate when you reach a
specified altitude.
1Hold .
2Select > Aviation > Altimeter Settings & Alerts >
Altitude Alert > Status > On.
3Select Altitude > Alert Threshold.
4Enter an altitude.
Setting the Low Oxygen Alert
You can set an alarm to vibrate when you reach a low
oxygen altitude.
NOTE: The low oxygen alert is not available in watch
mode.
1Hold .
2Select > Aviation > Altimeter Settings & Alerts > O2
Alert > Status > On.
3Select Altitude > Alert Threshold.
4Enter an altitude.
Setting the Barometric Pressure
You can set the current barometric pressure manually or
to the pressure at the nearest airport. Manually adjusting
the barometric pressure can help to improve the accuracy
of the pressure altitude reading.
1Hold .
2Select > Aviation > Altimeter Settings & Alerts >
Barometer.
3Select an option:
• To set the barometric pressure to the nearest
airport, select METAR.
• To set the barometric pressure manually, select
Manual, and enter a barometric correction value.
Setting the Fuel Tank Reminder
You can set an alarm to sound and display a message
reminding you to check the fuel tank gauges.
NOTE: The fuel tank reminder is available only during a
flying activity.
1Hold .
2Select > Aviation > Fuel Tank Reminder > Status >
On.
3Select Time.
4Enter a time.
Selecting a Favorite Airport
When you select a favorite airport, you can view the
waypoint and METAR information for it on the default
watch face and aviation glances.
1Hold .
2Select > Aviation > Favorite Airport.
3Select an option:
• To search for an airport by its identifier, select Enter
Ident., enter all or part of the alphanumeric identifier,
and press .
• To search for an airport near you, select Nearest,
and wait while the watch locates satellites.
• To select an airport from your flight plan, select
Flight Plan.
A list of airports appears.
4Select an airport.
Flying Activity
A flying activity starts automatically when your detected
climb rate exceeds the value you set in the auto fly
settings. The default auto fly value is 200 fpm.
2 Flying

Setting the Auto Fly Value
1Hold .
2Select Activities & Apps > FLY.
3Select the activity settings.
4Select Auto Fly.
5Select the auto fly value.
A flying activity starts automatically when your
detected climb rate exceeds this value.
Starting a Flight
1Press .
2Select FLY.
3Go outside to an area with a clear view of the sky, and
wait while the watch locates satellites.
4Press to start the flight timer.
NOTE: Your activity data is recorded only while the
flight timer is running.
5Start your activity.
6After you complete your activity, press , and select
.
Viewing Your SpO2 Readings in Flight
WARNING
The SpO2 readings are intended for backup information
only. Always defer to applicable flight instruments for
primary awareness.
The D2 Air X10 watch has a wrist-based pulse oximeter to
gauge the saturation of oxygen in your blood (SpO2).
Knowing your oxygen saturation can help you determine
how your body is adjusting to high altitudes. As your
altitude increases, the level of oxygen in your blood can
decrease. During a flight, the watch automatically takes
pulse oximeter readings more frequently, so you can
monitor your SpO2 percentage.
TIP: You can improve the accuracy of your SpO2 readings
by turning on all-day acclimation mode in the pulse
oximeter glance settings (Changing the Pulse Oximeter
Tracking Mode, page 14).
1Start a FLY activity.
2Swipe up or down to scroll through the data screens.
Your most recent reading appears as an oxygen
saturation percentage.
NOTE: If you are too active for the watch to determine
your oxygen saturation, dashes appear instead of a
percentage. You should remain stationary for up to 30
seconds while the watch reads your blood oxygen
saturation.
Navigating to the Nearest Airport
1Hold .
2Select > Nearest.
3If necessary, go outside to an area with a clear view of
the sky, and wait while the watch locates satellites.
A list of the nearest airports appears.
4Select an airport.
5Press to start the flight timer.
NOTE: Your activity data is recorded only while the
flight timer is running.
Nearest Airports
Nearest airport identifier
Distance to the nearest airport
Bearing to the nearest airport
Navigating to an Aviation Waypoint by Its Identifier
You can navigate directly to an aviation waypoint by
searching for an alphanumeric identifier.
1Hold .
2Select > Enter Ident..
3Enter all or part of the alphanumeric identifier.
4Press .
A list of matching waypoints appears.
5Select the waypoint.
6Go outside to an area with a clear view of the sky, and
wait while the watch locates satellites.
7Press to begin navigation.
Navigating Directly to a Saved Location
Before you can navigate to a saved location, your watch
must locate satellites.
1Press .
2Select Navigate > Saved Locations.
3Select a location, and select Direct-To.
4Press to start the flight timer.
Horizontal Situation Indicator
Flying 3

Distance to the waypoint.
Course deviation indicator (CDI). Indicates the
location of the desired course line in relation to
your location.
Course deviation distance. The dots indicate your
distance off course.
To-and-from indicator. Indicates whether you are
headed toward or away from the waypoint.
Estimated time en route (ETE). The time remaining
until you reach your destination.
Stopping Navigation
Hold , and select Stop Course.
Disabling the Automatic Flight Timer
You can disable the automatic flight timer so your watch
does not automatically record flight data when your
ground speed exceeds 30 kn.
1Hold .
2Select > Activities & Apps > FLY.
3Select the activity settings.
4Select Flight Timer > Manual.
Flight Plans
A flight plan is a sequence of waypoints or locations that
leads you to your final destination. Flight plans use direct
routing optimized for aviation. You can create flight plans
using the Garmin Pilot™ app for mobile devices.
Finding a Waypoint
1Press .
2Select Navigate > Flight Planning.
3Select an option:
• To find a waypoint by name, select Enter Ident..
• To select your favorite airport, select Favorite.
• To select from a list of the nearest airports, select
Nearest Airports.
• To select from a list of the nearest navigational aids,
select Nearest Navaids.
• To select from a list of the nearest intersections,
select Nearest Intersection.
4Select a location.
Sending a Flight Plan to Your Watch
You can use the Garmin Pilot app to create flight plans
and send them to your D2 Air X10 watch.
1Connect your watch to the Garmin Pilot app
(Connecting to the Garmin Pilot App, page 6).
2In the Garmin Pilot app, select Home > Flight Plan.
3Create a flight plan.
4Select Menu > Connext.
5Select Send To to send the flight plan to your watch.
Following a Flight Plan
1Press .
2Select Navigate > Flight Planning > Connext Flight
Plan.
3Select an option:
• To begin navigation for the entire flight plan, press
.
• To navigate to a specific waypoint, select the
waypoint, and press .
4Press to start the flight timer.
Smart Features
Pairing Your Phone
To set up the D2 Air X10 watch, it must be paired directly
through the Garmin Connect app and the Bluetooth®
settings on your phone.
1From the app store on your phone, install and open the
Garmin Connect app.
2Select an option to enable pairing mode on your watch:
• If this is the first time you are setting up your watch,
hold to turn on the watch.
• If you previously skipped the pairing process or
paired your watch with a different phone, hold ,
and select > Connectivity > Phone > Pair Phone
to manually enter pairing mode.
3Select an option to add your watch to your Garmin
Connect account:
• If this is the first device you have paired with the
Garmin Connect app, follow the on-screen
instructions.
• If you have already paired another device with the
Garmin Connect app, from the or menu,
select Garmin Devices > Add Device, and follow the
on-screen instructions.
Connected Features
Connected features are available for your D2 Air X10
watch when you connect it to a compatible phone using
Bluetooth technology and install the Garmin Connect app
on the connected phone. Go to www.garmin.com/apps for
more information. Some features are also available when
you connect your watch to a Wi‑Fi network.
Phone notifications: Displays phone notifications and
messages on your D2 Air X10 watch.
LiveTrack: Allows friends and family to follow your races
and training activities in real time. You can invite
followers using email or social media, allowing them to
view your live data on a Garmin Connect tracking page.
Activity uploads to Garmin Connect: Automatically sends
your activity to your Garmin Connect account as soon
as you finish recording the activity.
Connect IQ™: Allows you to extend your watch features
with new watch faces, glances, apps, and data fields.
4 Smart Features

Bluetooth sensors: Allows you to connect Bluetooth
compatible sensors, such as a heart rate monitor.
Find my phone: Locates your lost phone that is paired with
your D2 Air X10 watch and currently within Bluetooth
range.
Find my device: Locates your lost D2 Air X10 watch that is
paired with your phone and currently within Bluetooth
range.
Phone Notifications
Phone notifications require a compatible phone to be
within Bluetooth range and paired with the watch. When
your phone receives messages, it sends notifications to
your watch.
Enabling Bluetooth Notifications
Before you can enable notifications, you must pair the D2
Air X10 watch with a compatible phone (Pairing Your
Phone, page 4).
1Hold .
2Select > Connectivity > Phone > Notifications.
3Select During Activity to set preferences for
notifications that appear when recording an activity.
4Select a notification preference.
5Select Not During Activity to set preferences for
notifications that appear when in watch mode.
6Select a notification preference.
7Select Timeout.
8Select a timeout duration.
9Select Privacy.
10 Select a privacy preference.
Viewing Notifications
1From the watch face, swipe up or down to view the
notifications glance.
2Select the glance.
3Select a notification to read the full notification.
4Swipe up to view the notification options.
5Select an option:
• To act on the notification, select an action, such as
Dismiss or Reply.
The available actions depend on the type of
notification and your phone operating system. When
you dismiss a notification on your phone or the D2
Air X10 watch, it no longer appears in the glance.
• To return to the notification list, swipe right.
Replying with a Customized Text Message
NOTE: This feature is available only if your watch is
connected to an Android™ phone using Bluetooth
technology.
When you receive a text message notification on your D2
Air X10 watch, you can send a quick reply by selecting
from a list of messages. You can customize messages in
the Garmin Connect app.
NOTE: This feature sends text messages using your
phone. Regular text message limits and charges may
apply. Contact your mobile carrier for more information.
1Swipe up or down to view the notifications glance.
2Select the glance.
3Select a text message notification.
4Swipe up to view the notification options.
5Select Reply.
6Select a message from the list.
Your phone sends the selected message as a text
message.
Calling from the Watch
NOTE: This feature is available only if your watch is
connected to a compatible phone using Bluetooth
technology.
1Hold .
2Select Phone Calling.
3Select an option:
• To dial a phone number using the dial pad, select
, dial the phone number, and select .
• To call a phone number from your contacts, select
, select a contact name, and select a phone
number.
• To view recent calls made or received on the watch,
swipe up.
NOTE: The watch does not sync with the recent
calls list on your phone.
TIP: You can select to hang up before the call
connects.
Receiving an Incoming Phone Call
When you receive a phone call on your connected phone,
the D2 Air X10 watch displays the name or phone number
of the caller.
• To accept the call, select .
• To decline the call, select .
• To decline the call and immediately send a text
message reply, select , and select a message from
the list.
NOTE: This feature is available only if your watch is
connected to an Android phone using Bluetooth
technology.
Managing Notifications
You can use your compatible phone to manage
notifications that appear on your D2 Air X10 watch.
Select an option:
• If you are using an iPhone®, go to the iOS®
notifications settings to select the items to show on
the watch.
• If you are using an Android phone, from the Garmin
Connect app, select Settings > Notifications.
Smart Features 5

Turning Off the Bluetooth Phone Connection
You can turn off the Bluetooth phone connection from the
controls menu.
NOTE: You can add options to the controls menu
(Customizing the Controls Menu, page 8).
1Hold to view the controls menu.
2Select to turn off the Bluetooth phone connection on
your D2 Air X10 watch.
Refer to the owner's manual for your phone to turn off
Bluetooth technology on your phone.
Using the Voice Assistant
You can communicate with the voice assistant on your
phone using the integrated speaker and microphone in
your watch.
NOTE: To use the voice assistant, your watch must be
connected to a compatible phone using Bluetooth
technology (Pairing Your Phone, page 4). See garmin.com
/voicefunctionality for information about compatible
phones.
1From any screen, hold .
When connected to the voice assistant on your phone,
appears.
2Say a command phrase, such as Call Mom or Send a
text message.
NOTE: Communication from the voice assistant is
audible only.
Using Do Not Disturb Mode
You can use do not disturb mode to turn off vibrations and
the display for alerts and notifications. This mode
disables the gesture setting (Customizing the Display
Settings, page 31). For example, you can use this mode
while sleeping or watching a movie.
• To manually turn on or off do not disturb mode, hold
, and select .
• To automatically turn on do not disturb mode during
your sleep hours, open the device settings in the
Garmin Connect app, and select Sounds & Alerts > Do
Not Disturb During Sleep.
Finding Your Phone
You can use this feature to help locate a lost phone that is
paired using Bluetooth technology and currently within
range.
1Hold .
2Select .
Signal strength bars appear on the D2 Air X10 screen,
and an audible alert sounds on your phone. The bars
increase as you move closer to your phone.
3Press to stop searching.
Connecting to the Garmin Pilot App
You can use the Garmin Pilot app to create flight plans
and send them to your D2 Air X10 watch. The Garmin Pilot
app is available for some mobile devices. See the app
store for your mobile device for availability and
compatibility information.
Your D2 Air X10 watch connects to the Garmin Pilot app
using Bluetooth technology. Go to garmin.com/pilotapp
for compatibility information.
1Pair your phone with your D2 Air X10 watch (Pairing
Your Phone, page 4).
2From the app store on your phone, install and open the
Garmin Pilot app.
3Sign in to the Garmin Pilot app with your Garmin®
account login credentials.
4In the Garmin Pilot app, select Home > Connext > All
Devices, and select your watch.
Updating the Aviation Database
Before you can update the aviation database, you must
create a Garmin account and add your watch. You can
view your unit ID on the device information screen
(Viewing Device Information, page 33).
The aviation database is valid for 28 days at a time and
includes worldwide airport locations, navigational aids,
and intersection data.
1Go to www.flyGarmin.com.
2Log in to your Garmin account.
3Select an option:
• Connect your watch to a computer using the
included USB cable.
• Connect your watch to a Wi‑Fi wireless network.
4Follow the on-screen instructions to update the
aviation database.
When your watch is connected to a Wi‑Fi wireless network,
database updates are downloaded automatically
overnight.
Connect IQ Features
You can add Connect IQ features to your watch from
Garmin and other providers using the Connect IQ app
(garmin.com/connectiqapp). You can customize your
watch with watch faces, device apps, data fields, and
music providers.
Watch Faces: Allow you to customize the appearance of
the clock.
Device Apps: Add interactive features to your watch, such
as glances and new outdoor and fitness activity types.
Data Fields: Allow you to download new data fields that
present sensor, activity, and history data in new ways.
You can add Connect IQ data fields to built-in features
and pages.
Music: Add music providers to your watch.
6 Smart Features

Downloading Connect IQ Features
Before you can download features from the Connect IQ
app, you must pair your D2 Air X10 watch with your phone
(Pairing Your Phone, page 4).
1From the app store on your phone, install and open the
Connect IQ app.
2If necessary, select your watch.
3Select a Connect IQ feature.
4Follow the on-screen instructions.
Downloading Connect IQ Features Using Your Computer
1Connect the watch to your computer using a USB
cable.
2Go to apps.garmin.com, and sign in.
3Select a Connect IQ feature, and download it.
4Follow the on-screen instructions.
Wi‑Fi Connected Features
Activity uploads to your Garmin Connect account:
Automatically sends your activity to your Garmin
Connect account as soon as you finish recording the
activity.
Audio content: Allows you to sync audio content from
third-party providers.
Software updates: You can download and install the latest
software.
Workouts and training plans: You can browse for and
select workouts and training plans on the Garmin
Connect site. The next time you sync your watch, the
files are wirelessly sent to your watch.
Connecting to a Wi‑Fi Network
You must connect your watch to the Garmin Connect app
on your phone or to the Garmin Express™ application on
your computer before you can connect to a Wi‑Fi network
(Using Garmin Connect on Your Computer, page 27).
To sync your watch with a third-party music provider, you
must connect to a Wi‑Fi network. Connecting the watch to
a Wi‑Fi network also helps to increase the transfer speed
of larger files.
1Move within range of a Wi‑Fi network.
2From the Garmin Connect app, select or .
3Select Garmin Devices, and select your watch.
4Select General > Wi-Fi Networks > Add a Network.
5Select an available Wi‑Fi network, and enter the login
details.
Controls
The controls menu lets you quickly access watch features
and options. You can add, reorder, and remove the options
in the controls menu (Customizing the Controls Menu,
page 8).
From any screen, hold .
Icon Name Description
Alarms Select to add or edit an alarm
(Setting an Alarm, page 31).
Altimeter Select to open the altimeter
screen.
Alt. Time
Zones
Select to view the current time of
day in additional time zones.
Assistance
Select to send an assistance
request (Requesting Assistance,
page 11).
Battery Saver
Select to enable or disable the
battery saver feature (Battery
Manager, page 30).
Brightness
Select to adjust the screen bright
ness (Customizing the Display
Settings, page 31).
Broadcast
Heart Rate
Select to turn on heart rate broad
casting to a paired device (Broad
casting Heart Rate, page 12).
Contacts
Select to open your Garmin
Connect contact list on your
watch.
Dial Pad Select to open the phone dial pad
(Calling from the Watch, page 5).
Do Not
Disturb
Select to enable or disable do not
disturb mode to dim the screen
and disable alerts and notifica
tions. For example, you can use
this mode while watching a
movie.
Find My
Phone
Select to play an audible alert on
your paired phone, if it is within
Bluetooth range. The Bluetooth
signal strength appears on the D2
Air X10 watch screen, and it
increases as you move closer to
your phone.
Lock Screen
Select to lock the buttons and the
touchscreen to prevent inadver
tent presses and swipes.
Controls 7

Icon Name Description
METAR Select to view METAR informa
tion for your favorite airport.
Music
Controls
Select to control music playback
on your watch or phone.
Nearest
Airports
Select to view the nearest
airports.
Phone Calling
Select to open the phone
controls, such as contacts and
the dial pad.
Phone
Connection
Select to enable or disable
Bluetooth technology and your
connection to your paired phone.
Power Off Select to turn off the watch.
Save
Location
Select to save your current
location to navigate back to it
later.
Set Time with
GPS
Select to sync your watch with
the time on your phone or using
satellites.
Stopwatch Select to start the stopwatch
(Using the Stopwatch, page 31).
Sync Select to sync your watch with
your paired phone.
Timer
Select to set a countdown timer
(Starting the Countdown Timer,
page 31).
Voice
Assistant
Select to connect to voice assis
tance (Using the Voice Assistant,
page 6).
Volume Select to open the watch volume
controls.
Wallet
Select to open your Garmin Pay
wallet and pay for purchases with
your watch (Garmin Pay,
page 9).
Waypoint
Select to view airport details,
including radio frequencies and
runway information.
Customizing the Controls Menu
You can add, remove, and change the order of the options
in the controls menu (Controls, page 7).
1Hold .
The controls menu appears.
2Hold .
The controls menu switches to edit mode.
3Select the shortcut you want to customize.
4Select an option:
• To change the location of the shortcut in the
controls menu, select the location where you want it
to appear, or drag the shortcut to a new location.
• To remove the shortcut from the controls menu,
select .
5If necessary, select to add a shortcut to the controls
menu.
NOTE: This option is available only after you remove at
least one shortcut from the menu.
Music
NOTE: This section is about three different music
playback options for your D2 Air X10 watch.
• Third-party provider music
• Personal audio content
• Music stored on your phone
On a D2 Air X10 watch, you can download audio content
to your watch from your computer or from a third-party
provider, so you can listen when your phone is not nearby.
To listen to audio content stored on your watch, you can
connect headphones with Bluetooth technology. You can
also listen to audio content directly through the speaker in
your watch.
Downloading Personal Audio Content
Before you can send your personal music to your watch,
you must install the Garmin Express application on your
computer (www.garmin.com/express).
You can load your personal audio files, such as .mp3
and .m4a files, to a D2 Air X10 watch from your computer.
For more information, go to www.garmin.com/musicfiles.
1Connect the watch to your computer using the included
USB cable.
2On your computer, open the Garmin Express
application, select your watch, and select Music.
TIP: For Windows® computers, you can select and
browse to the folder with your audio files. For Apple®
computers, the Garmin Express application uses your
iTunes® library.
3In the My Music or iTunes Library list, select an audio
file category, such as songs or playlists.
4Select the checkboxes for the audio files, and select
Send to Device.
5If necessary, in the D2 Air X10 list, select a category,
select the checkboxes, and select Remove From
Device to remove audio files.
Connecting to a Third-Party Provider
Before you can download music or other audio files to
your watch from a supported third-party provider, you
must connect the provider to your watch.
Some third-party music provider options are already
installed on your watch. For more options, you can
8 Music

download the Connect IQ app on your phone (Connect IQ
Features, page 6).
1From the controls menu on the watch, select .
2Select the music provider.
NOTE: If you want to select another provider, hold ,
select Music Providers, and follow the on-screen
instructions.
Downloading Audio Content from a Third-Party Provider
Before you can download audio content from a third-party
provider, you must connect to a Wi‑Fi network (Connecting
to a Wi‑Fi Network, page 7).
1Open the music controls.
2Hold .
3Select Music Providers.
4Select a connected provider.
5Select a playlist or other item to download to the
watch.
6If necessary, press until you are prompted to sync
with the service.
NOTE: Downloading audio content can drain the battery.
You may be required to connect the watch to an external
power source if the battery is low.
Disconnecting from a Third-Party Provider
1From the Garmin Connect app, select or .
2Select Garmin Devices, and select your watch.
3Select Music.
4Select an installed third-party provider, and follow the
on-screen instructions to disconnect the third-party
provider from your watch.
Connecting Bluetooth Headphones
1Bring the headphones within 2 m (6.6 ft.) of your
watch.
2Enable pairing mode on the headphones.
3Hold .
4Select > Music > Headphones > Add New.
5Select your headphones to complete the pairing
process.
Listening to Music
1Open the music controls.
2If necessary, connect your headphones with Bluetooth
technology (Connecting Bluetooth Headphones,
page 9).
3Hold .
4Select Music Providers, and select an option:
• To listen to music downloaded to the watch from
your computer, select My Music (Downloading
Personal Audio Content, page 8).
• To control music playback on your phone, select
Phone.
• To listen to music from a third-party provider, select
the name of the provider and select a playlist.
5Select .
Music Playback Controls
NOTE: Music playback controls may look different,
depending on the selected music source.
Select to view more music playback controls.
Select to adjust the volume.
Select to play and pause the current audio file.
Select to skip to the next audio file in the
playlist.
Hold to fast forward through the current audio
file.
Select to restart the current audio file.
Select twice to skip to the previous audio file in
the playlist.
Hold to rewind through the current audio file.
Select to change the repeat mode.
Select to change the shuffle mode.
Garmin Pay
The Garmin Pay feature allows you to use your watch to
pay for purchases in participating locations using credit or
debit cards from a participating financial institution.
Setting Up Your Garmin Pay Wallet
You can add one or more participating credit or debit
cards to your Garmin Pay wallet. Go to garmin.com
Garmin Pay 9

/garminpay/banks to find participating financial
institutions.
1From the Garmin Connect app, select or .
2Select Garmin Pay > Get Started.
3Follow the on-screen instructions.
Paying for a Purchase Using Your Watch
Before you can use your watch to pay for purchases, you
must set up at least one payment card.
You can use your watch to pay for purchases in a
participating location.
1Hold .
2Select .
3Enter your four-digit passcode.
NOTE: If you enter your passcode incorrectly three
times, your wallet locks, and you must reset your
passcode in the Garmin Connect app.
Your most recently used payment card appears.
4If you have added multiple cards to your Garmin Pay
wallet, swipe to change to another card (optional).
5Within 60 seconds, hold your watch near the payment
reader, with the watch facing the reader.
The watch vibrates and displays a check mark when it
is finished communicating with the reader.
6If necessary, follow the instructions on the card reader
to complete the transaction.
TIP: After you successfully enter your passcode, you can
make payments without a passcode for 24 hours while
you continue to wear your watch. If you remove the watch
from your wrist or disable heart rate monitoring, you must
enter the passcode again before making a payment.
Adding a Card to Your Garmin Pay Wallet
You can add up to 10 credit or debit cards to your
Garmin Pay wallet.
1From the Garmin Connect app, select or .
2Select Garmin Pay > > Add Card.
3Follow the on-screen instructions.
After the card is added, you can select the card on your
watch when you make a payment.
Managing Your Garmin Pay Cards
You can temporarily suspend or delete a card.
NOTE: In some countries, participating financial
institutions may restrict the Garmin Pay features.
1From the Garmin Connect app, select or .
2Select Garmin Pay.
3Select a card.
4Select an option:
• To temporarily suspend or unsuspend the card,
select Suspend Card.
The card must be active to make purchases using
your D2 Air X10 watch.
• To delete the card, select .
Changing Your Garmin Pay Passcode
You must know your current passcode to change it. If you
forget your passcode, you must reset the Garmin Pay
feature for your D2 Air X10 watch, create a new passcode,
and reenter your card information.
1From the D2 Air X10 device page in the Garmin
Connect app, select Garmin Pay > Change Passcode.
2Follow the on-screen instructions.
The next time you pay using your D2 Air X10 watch, you
must enter the new passcode.
Safety and Tracking Features
CAUTION
The safety and tracking features are supplemental
features and should not be relied on as a primary method
to obtain emergency assistance. The Garmin Connect app
does not contact emergency services on your behalf.
The D2 Air X10 watch has safety and tracking features
that must be set up with the Garmin Connect app.
NOTICE
To use these features, the D2 Air X10 watch must be
connected to the Garmin Connect app using Bluetooth
technology. You can enter emergency contacts in your
Garmin Connect account.
For more information about safety and tracking features,
go to www.garmin.com/safety.
Assistance: Allows you to send a message with your
name, LiveTrack link, and GPS location (if available) to
your emergency contacts.
Incident detection: When the D2 Air X10 watch detects an
incident during certain outdoor activities, the watch
sends an automated message, LiveTrack link, and GPS
location (if available) to your emergency contacts.
LiveTrack: Allows friends and family to follow your races
and training activities in real time. You can invite
followers using email or social media, allowing them to
view your live data on a web page.
Adding Emergency Contacts
Emergency contact phone numbers are used for the
safety and tracking features. One phone number from
10 Safety and Tracking Features

your emergency contacts or an emergency services phone
number, such as 911, can be used as your emergency
calling number.
1From the Garmin Connect app, select or .
2Select Safety & Tracking > Safety Features >
Emergency Contacts > Add Emergency Contacts.
3Follow the on-screen instructions.
Adding Contacts
You can add up to 50 contacts to the Garmin Connect
app. Contact emails can be used with the LiveTrack
feature.
Three of these contacts can be used as emergency
contacts.
One phone number from your emergency contacts or an
emergency services phone number, such as 911, can be
used as your emergency calling number (Adding
Emergency Contacts, page 10).
1From the Garmin Connect app, select or .
2Select Contacts.
3Follow the on-screen instructions.
After you add contacts, you must sync your data to apply
the changes to your D2 Air X10 watch (Using the Garmin
Connect App, page 27).
Incident Detection
CAUTION
Incident detection is a supplemental feature designed for
outdoor use. Incident detection should not be relied on as
a primary method to obtain emergency assistance.
Turning Incident Detection On and Off
NOTE: Your paired phone must be equipped with a data
plan and be in an area of network coverage where data is
available.
Before you can enable incident detection on your watch,
you must set up emergency contacts in the Garmin
Connect app (Adding Emergency Contacts, page 10). Your
emergency contacts must be able to receive emails or text
messages (standard text messaging rates may apply).
1From the watch face, hold .
2Select > Safety & Tracking > Incident Detection.
3Select an activity.
NOTE: Incident detection is available only for certain
outdoor activities.
When an incident is detected by your D2 Air X10 watch
with GPS enabled, the Garmin Connect app can send an
automated text message and email with your name and
GPS location to your emergency contacts. You have 15
seconds to cancel. If an emergency calling phone number
has been designated, you also have the option to call that
phone number from your watch.
Requesting Assistance
NOTE: Your paired phone must be equipped with a data
plan and be in an area of network coverage where data is
available.
Before you can request assistance, you must set up
emergency contacts (Adding Emergency Contacts,
page 10). Your emergency contacts must be able to
receive emails or text messages (standard text
messaging rates may apply). If an emergency calling
phone number has been designated, you have the option
to call that phone number from your watch.
1Hold .
2When you feel three vibrations, release the button to
activate the assistance feature.
The countdown screen appears.
3If necessary, select an option before the countdown is
complete:
• To send a customized message with your request,
select .
• To call your emergency calling phone number, select
.
• To cancel the message, select .
Heart Rate Features
The D2 Air X10 watch has a wrist-based heart rate monitor
and is also compatible with chest heart rate monitors
(sold separately). You can view heart rate data on the
heart rate glance. If both wrist-based heart rate and chest
heart rate data are available when you start an activity,
your watch uses the chest heart rate data.
Wrist-based Heart Rate
Wearing the Watch
CAUTION
Some users may experience skin irritation after prolonged
use of the watch, especially if the user has sensitive skin
or allergies. If you notice any skin irritation, remove the
watch and give your skin time to heal. To help prevent skin
irritation, ensure the watch is clean and dry, and do not
overtighten the watch on your wrist. For more information,
go to garmin.com/fitandcare.
• Wear the watch above your wrist bone.
NOTE: The watch should be snug but comfortable. For
more accurate heart rate readings, the watch should
not shift while running or exercising. For pulse oximeter
readings, you should remain motionless.
Heart Rate Features 11

NOTE: The optical sensor is located on the back of the
watch.
• See Tips for Erratic Heart Rate Data, page 12 for more
information about wrist-based heart rate.
• See Tips for Erratic Pulse Oximeter Data, page 14 for
more information about the pulse oximeter sensor.
• For more information about accuracy, go to
garmin.com/ataccuracy.
• For more information about watch wear and care, go to
www.garmin.com/fitandcare.
Tips for Erratic Heart Rate Data
If the heart rate data is erratic or does not appear, you can
try these tips.
• Clean and dry your arm before putting on the watch.
• Avoid wearing sunscreen, lotion, and insect repellent
under the watch.
• Avoid scratching the heart rate sensor on the back of
the watch.
• Wear the watch above your wrist bone. The watch
should be snug but comfortable.
• Wait until the icon is solid before starting your
activity.
• Warm up for 5 to 10 minutes and get a heart rate
reading before starting your activity.
NOTE: In cold environments, warm up indoors.
• Rinse the watch with fresh water after each workout.
• While exercising, use a silicone band.
Viewing Heart Rate Information
1From the watch face, swipe up or down to view the
heart rate glance.
The heart rate glance displays your current heart rate in
beats per minute (bpm).
2Select the glance to view a graph of your heart rate
since midnight.
The graph shows your recent heart rate activity, high
and low heart rate, and color-coded bars to indicate the
time spent in each heart rate zone (About Heart Rate
Zones, page 12).
3Swipe up to view your resting heart rate (RHR) values
for the last 7 days.
Setting an Abnormal Heart Rate Alert
CAUTION
This feature only alerts you when your heart rate exceeds
or drops below a certain number of beats per minute, as
selected by the user, after a period of inactivity. This
feature does not notify you of any potential heart
condition and is not intended to treat or diagnose any
medical condition or disease. Always defer to your health
care provider for any heart-related issues.
1Hold .
2Select > Wrist Heart Rate > Abnormal Heart Rate
Alerts.
3Select High Alert or Low Alert.
4Select a heart rate threshold value.
5Select the toggle to turn on the alert.
Each time you exceed or drop below the custom value, a
message appears and the watch vibrates.
Broadcasting Heart Rate
You can broadcast your heart rate data from your D2 Air
X10 watch and view it on paired devices. For example, you
can broadcast your heart rate data to an Edge® device
while cycling.
NOTE: Broadcasting heart rate data decreases battery life.
1Hold .
2Select > Wrist Heart Rate.
3Select an option:
• Select Broadcast In Activity to broadcast heart rate
data during timed activities (Starting an Activity,
page 19).
• Select Broadcast to start broadcasting heart rate
data now.
4Pair your D2 Air X10 watch with your compatible
device.
NOTE: The pairing instructions differ for each Garmin
compatible device. See your owner's manual.
Turning Off the Wrist-based Heart Rate Monitor
The default value for the Wrist Heart Rate setting is Auto.
The watch automatically uses the wrist-based heart rate
monitor unless you pair a chest heart rate monitor to the
watch. Chest heart rate data is only available during an
activity.
NOTE: Disabling the wrist-based heart rate monitor also
disables features such as your VO2 max. estimate, sleep
tracking, intensity minutes, the all-day stress feature, and
the wrist-based pulse oximeter sensor.
NOTE: Disabling the wrist-based heart rate monitor also
disables the on-wrist detection feature for Garmin Pay
payments, and you must enter a passcode before making
each payment (Garmin Pay, page 9).
1Hold .
2Select > Wrist Heart Rate > Status > Off.
About Heart Rate Zones
Many athletes use heart rate zones to measure and
increase their cardiovascular strength and improve their
level of fitness. A heart rate zone is a set range of
heartbeats per minute. The five commonly accepted heart
rate zones are numbered from 1 to 5 according to
12 Heart Rate Features

increasing intensity. Generally, heart rate zones are
calculated based on percentages of your maximum heart
rate.
Setting Your Heart Rate Zones
The watch uses your user profile information from the
initial setup to determine your default heart rate zones.
The watch has separate heart rate zones for running and
cycling. For the most accurate calorie data during your
activity, you should set your maximum heart rate. You can
also set each heart rate zone. You can manually adjust
your zones on the watch or using your Garmin Connect
account.
1Hold .
2Select > User Profile > Heart Rate Zones.
3Select Default to view the default values (optional).
The default values can be applied to running and
cycling.
4Select Running or Cycling.
5Select Preference > Set Custom.
6Select Max. HR, and enter your maximum heart rate.
7Select a zone, and enter a value for each zone.
Fitness Goals
Knowing your heart rate zones can help you measure and
improve your fitness by understanding and applying these
principles.
• Your heart rate is a good measure of exercise intensity.
• Training in certain heart rate zones can help you
improve cardiovascular capacity and strength.
If you know your maximum heart rate, you can use the
table (Heart Rate Zone Calculations, page 13) to
determine the best heart rate zone for your fitness
objectives.
If you do not know your maximum heart rate, use one of
the calculators available on the Internet. Some gyms and
health centers can provide a test that measures maximum
heart rate. The default maximum heart rate is 220 minus
your age.
Heart Rate Zone Calculations
Zone
% of
Maximum
Heart Rate
Perceived
Exertion Benefits
1 50–60%
Relaxed, easy
pace, rhythmic
breathing
Beginning-level
aerobic training,
reduces stress
2 60–70%
Comfortable
pace, slightly
deeper breathing,
conversation
possible
Basic cardiovas
cular training,
good recovery
pace
3 70–80% Moderate pace,
more difficult to
Improved
aerobic capacity,
Zone
% of
Maximum
Heart Rate
Perceived
Exertion Benefits
hold conversa
tion
optimal cardio
vascular training
4 80–90%
Fast pace and a
bit uncomfort
able, breathing
forceful
Improved
anaerobic
capacity and
threshold,
improved speed
5 90–100%
Sprinting pace,
unsustainable for
long period of
time, labored
breathing
Anaerobic and
muscular
endurance,
increased power
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 cardiovascular strength and should
increase as your level of fitness improves.
On the watch, your VO2 max. estimate appears as a
number and description. On your Garmin Connect
account, you can view additional details about your VO2
max. estimate.
VO2 max. data is provided by Firstbeat Analytics™. VO2
max. analysis is provided with permission from The
Cooper Institute®. For more information, see the appendix
(VO2 Max. Standard Ratings, page 38), and go to
www.CooperInstitute.org.
Getting Your VO2 Max. Estimate
The watch requires heart rate data and a timed, (up to 15
minutes) brisk outdoor walk or run to display your VO2
max. estimate.
1Hold .
2Select > User Profile > VO2 Max.
If you have already recorded a brisk walk or run
outdoors, your VO2 max. estimate may appear. The
watch displays the date your VO2 max. estimate was
last updated. The watch updates your VO2 max.
estimate each time you complete an outdoor walk or
run of 15 minutes or longer. You can manually start a
VO2 max. test to get an updated estimate.
3To start a VO2 max. test, tap the screen.
4Follow the on-screen instructions to get your VO2 max.
estimate.
A message appears when the test is complete.
Viewing Your Fitness Age
Your fitness age gives you an idea of how your fitness
compares with a person of the same gender. Your watch
uses information, such as your age, body mass index
(BMI), resting heart rate data, and vigorous activity history
to provide a fitness age. If you have a Garmin Index™ scale,
Heart Rate Features 13

your watch uses the body fat percentage metric instead of
BMI to determine your fitness age. Exercise and lifestyle
changes can impact your fitness age.
NOTE: For the most accurate fitness age, complete the
user profile setup (Setting Up Your User Profile, page 24).
1Hold .
2Select > User Profile > Fitness Age.
Pulse Oximeter
The D2 Air X10 watch has a wrist-based pulse oximeter to
gauge the saturation of oxygen in your blood. Knowing
your oxygen saturation can be valuable in understanding
your overall health and help you determine how your body
is adapting to altitude. Your watch gauges your blood
oxygen level by shining light into the skin and checking
how much light is absorbed. This is referred to as SpO2.
On the watch, your pulse oximeter readings appear as an
SpO2 percentage. On your Garmin Connect account, you
can view additional details about your pulse oximeter
readings, including trends over multiple days (Changing
the Pulse Oximeter Tracking Mode, page 14). For more
information on pulse oximeter accuracy, go to
garmin.com/ataccuracy.
Getting Pulse Oximeter Readings
You can manually begin a pulse oximeter reading from the
pulse oximeter glance. The accuracy of the pulse oximeter
reading can vary based on your blood flow, the watch
placement on your wrist, and your stillness.
NOTE: You may need to add the pulse oximeter glance to
the glance loop (Customizing the Glances, page 16).
1While you are sitting or inactive, swipe up or down to
view the pulse oximeter glance.
2Select the glance to begin the reading.
3Hold the arm wearing the watch at heart level while the
watch reads your blood oxygen saturation.
4Keep still.
The watch displays your oxygen saturation as a
percentage, and a graph of your pulse oximeter
readings and heart rate values since midnight.
Changing the Pulse Oximeter Tracking Mode
1Hold .
2Select > Wrist Heart Rate > Pulse Ox > Tracking
Mode.
3Select an option:
• To turn on measurements while you are inactive
during the day, select All Day.
NOTE: Turning on pulse oximeter tracking
decreases battery life.
• To turn on continuous measurements while you
sleep, select During Sleep.
NOTE: Unusual sleep positions can cause
abnormally low sleep-time SpO2 readings.
• To turn off automatic measurements, select On
Demand.
Tips for Erratic Pulse Oximeter Data
If the pulse oximeter data is erratic or does not appear,
you can try these tips.
• Remain motionless while the watch reads your blood
oxygen saturation.
• Wear the watch above your wrist bone. The watch
should be snug but comfortable.
• Hold the arm wearing the watch at heart level while the
watch reads your blood oxygen saturation.
• Use a silicone or nylon band.
• Clean and dry your arm before putting on the watch.
• Avoid wearing sunscreen, lotion, and insect repellent
under the watch.
• Avoid scratching the optical sensor on the back of the
watch.
• Rinse the watch with fresh water after each workout.
Activity Tracking
The activity tracking feature records your daily step count,
distance traveled, intensity minutes, floors climbed,
calories burned, and sleep statistics for each recorded
day. Your calories burned includes your base metabolism
plus activity calories.
The number of steps taken during the day appears on the
steps glance. The step count is updated periodically.
For more information about activity tracking and fitness
metric accuracy, go to garmin.com/ataccuracy.
Auto Goal
Your watch creates a daily step goal automatically, based
on your previous activity levels. As you move during the
day, the watch shows your progress toward your daily goal
.
If you choose not to use the auto goal feature, you can set
a personalized step goal on your Garmin Connect
account.
Using the Move Alert
Sitting for prolonged periods of time can trigger
undesirable metabolic state changes. The move alert
reminds you to keep moving. After one hour of inactivity, a
message appears, and the red bar appears on the steps
glance. Additional segments appear after every 15
minutes of inactivity. The watch also vibrates, if vibration
is turned on (System Settings, page 30).
Go for a short walk (at least a couple of minutes) to
reset the move alert.
14 Activity Tracking