Garmin Descent Mk2i Owner's Manual

Descent™ Mk2i

Owner’s Manual

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®, ANT+®, Approach®, Auto Lap®, Auto Pause®, Edge®, inReach®, QuickFit®, TracBack®, VIRB®, Virtual Partner®, and Xero® are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. Body Battery™, Connect IQ™, Descent™, Garmin Connect™, Garmin Dive™, Garmin Explore™, Garmin Express™, Garmin Golf™, Garmin Move IQ™, Garmin Pay™, HRM-Run™, HRM-Swim™, HRM-Tri™, Subwave™, tempe™, TruSwing™, TrueUp™, Varia™, Varia Vision™, and Vector™ are trademarks of Garmin Ltd. or its subsidiaries. These trademarks may not be used without the express permission of Garmin.

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This product is ANT+® certified. Visit www.thisisant.com/directory for a list of compatible products and apps.

™

Introduction.....................................................................1

Getting Started............................................................................1

Buttons................................................................................... 1

Using the Watch.....................................................................1

Viewing the Controls Menu............................................... 1

Viewing Widgets................................................................1

Customizing the Watch.......................................................... 2

Default Watch Face............................................................... 2

Pairing Your Smartphone........................................................... 2

Charging the Device................................................................... 2

Product Updates......................................................................... 2

Setting Up Garmin Express................................................... 2

Diving.............................................................................. 2

Dive Warnings............................................................................ 2

Dive Modes................................................................................. 3

Using the Pool Dive Mode..................................................... 3

Dive Setup.................................................................................. 3

Setting Up Your Breathing Gases.......................................... 3

Setting PO2 Thresholds......................................................... 4

Setting CCR Setpoints........................................................... 4

Air Integration............................................................................. 4

Installation and Setup............................................................ 4

Transmitter Position Tips.................................................. 4

Installing the Transmitter on Your Tank Regulator........... 5

Installing the Transmitter on a High Pressure Hose

Extension.......................................................................... 5

Pairing the Transmitter with a Descent Mk2i Dive

Computer............................................................................... 6

Selecting Paired Transmitters to View on Your Dive Data

Screens............................................................................. 6

Transmitter Settings............................................................... 6

Selecting the Gas Consumption Rate Metric......................... 7

Including Transmitters in Gas Consumption Calculations..... 7

Dive Data Screens...................................................................... 7

Single-Gas and Multi-Gas Data Screens............................... 7

CCR Data Screens................................................................ 7

Gauge Data Screens............................................................. 8

Apnea and Apnea Hunt Data Screens................................... 8

Starting a Dive............................................................................ 8

Navigating with the Dive Compass........................................ 8

Using the Dive Stopwatch...................................................... 8

Viewing the Transmitter Data Screens.................................. 9

Switching Gases During a Dive............................................. 9

Switching Between CC and OC Diving for a Bailout

Procedure.............................................................................. 9

Performing a Safety Stop....................................................... 9

Performing a Decompression Stop........................................ 9

Diving with the Map..............................................................10

Viewing the Surface Interval Widget......................................... 10

Viewing the Dive Log Widget.................................................... 10

Dive Planning............................................................................10

Calculating NDL Time.......................................................... 10

Creating a Decompression Plan.......................................... 10

Viewing and Applying a Decompression Plan..................... 11

Editing a Decompression Plan............................................. 11

Deleting a Decompression Plan...........................................11

No-Fly Time.............................................................................. 11

Altitude Diving........................................................................... 11

Tips for Wearing the Device with an Exposure Suit................. 11

Dive Alerts................................................................................ 11

Transmitter Alerts..................................................................... 12

Enabling Lost Transmitter Alerts.......................................... 12

Dive Terminology...................................................................... 12

Activities and Apps...................................................... 12

Starting an Activity.................................................................... 12

Tips for Recording Activities................................................ 13

Changing the Power Mode.................................................. 13

Stopping an Activity.................................................................. 13

Adding or Removing a Favorite Activity.................................... 13

Creating a Custom Activity....................................................... 13

Indoor Activities........................................................................ 13

Going for a Virtual Run........................................................ 13

Calibrating the Treadmill Distance....................................... 13

Recording a Strength Training Activity.................................13

Outdoor Activities......................................................................14

Viewing Tide Information..................................................... 14

Viewing Your Ski Runs........................................................ 14

Recording a Backcountry Skiing Activity..............................14

Using the Metronome...........................................................14

Playing Audio Prompts During an Activity............................15

Jumpmaster......................................................................... 15

Multisport.................................................................................. 15

Triathlon Training................................................................. 15

Creating a Multisport Activity............................................... 15

Swimming................................................................................. 15

Swim Terminology............................................................... 15

Stroke Types........................................................................ 15

Tips for Swimming Activities................................................ 15

Resting During Pool Swimming........................................... 16

Auto Rest............................................................................. 16

Training with the Drill Log.................................................... 16

Turning Off Wrist-based Heart Rate While Swimming......... 16

Golfing...................................................................................... 16

Playing Golf..........................................................................16

Hole Information...................................................................16

Big Numbers Mode......................................................... 16

Measuring Distance with Button Targeting.......................... 16

Changing Holes................................................................... 16

Moving the Flag................................................................... 17

Viewing Measured Shots..................................................... 17

Viewing Layup and Dogleg Distances................................. 17

Saving Custom Targets...................................................17

Keeping Score..................................................................... 17

Updating a Score............................................................ 17

Setting the Scoring Method............................................. 17

Setting Your Handicap.................................................... 17

Enabling Statistics Tracking............................................ 17

TruSwing™.......................................................................... 17

Using the Golf Odometer..................................................... 18

Viewing PlaysLike Distance................................................. 18

Viewing the Direction to the Pin........................................... 18

Starting an Expedition.............................................................. 18

Changing the Track Point Recording Interval...................... 18

Recording a Track Point Manually....................................... 18

Viewing Track Points........................................................... 18

Connected Features..................................................... 18

Enabling Bluetooth Notifications............................................... 18

Viewing Notifications............................................................ 19

Receiving an Incoming Phone Call...................................... 19

Replying to a Text Message................................................ 19

Managing Notifications.........................................................19

Turning Off the Bluetooth Smartphone Connection.................. 19

Turning On and Off Smartphone Connection Alerts................. 19

Locating a Lost Mobile Device.................................................. 19

Garmin Dive App...................................................................... 19

Garmin Connect........................................................................19

Updating the Software Using the Smartphone Apps........... 20

Updating the Software Using Garmin Express.................... 20

Using Garmin Connect on Your Computer..................... 20

Table of Contents i

Manually Syncing Data with Garmin Connect..................... 20

Garmin Explore™..................................................................... 20

Garmin Golf™ App................................................................... 20

Safety and Tracking Features..................................... 20

Adding Emergency Contacts.................................................... 20

Adding Contacts....................................................................... 21

Turning Incident Detection On and Off..................................... 21

Requesting Assistance............................................................. 21

Starting a GroupTrack Session.................................................21

Tips for GroupTrack Sessions............................................. 21

GroupTrack Settings............................................................ 21

Wi‑Fi® Connected Features........................................ 21

Connecting to a Wi‑Fi Network................................................. 21

Connect IQ Features.................................................... 21

Downloading Connect IQ Features.......................................... 22

Downloading Connect IQ Features Using Your Computer....... 22

Garmin Pay................................................................... 22

Setting Up Your Garmin Pay Wallet......................................... 22

Paying for a Purchase Using Your Watch................................ 22

Adding a Card to Your Garmin Pay Wallet............................... 22

Managing Your Garmin Pay Cards...................................... 22

Changing Your Garmin Pay Passcode..................................... 22

Music............................................................................. 22

Connecting to a Third-Party Provider....................................... 22

Downloading Audio Content from a Third-Party Provider.... 23

Downloading Audio Content from Spotify®......................... 23

Changing the Music Provider............................................... 23

Disconnecting from a Third-Party Provider.......................... 23

Downloading Personal Audio Content...................................... 23

Listening to Music..................................................................... 23

Music Playback Controls.......................................................... 23

Connecting Bluetooth Headphones.......................................... 23

Changing the Audio Mode........................................................ 23

Heart Rate Features..................................................... 23

Wrist-based Heart Rate............................................................ 23

Wearing the Device..............................................................23

Tips for Erratic Heart Rate Data...........................................24

Viewing the Heart Rate Widget............................................ 24

Broadcasting Heart Rate Data to Garmin Devices.............. 24

Broadcasting Heart Rate Data During an Activity........... 24

Setting an Abnormal Heart Rate Alert................................. 24

Turning Off the Wrist-based Heart Rate Monitor................. 24

Running Dynamics....................................................................24

Training with Running Dynamics......................................... 25

Color Gauges and Running Dynamics Data........................ 25

Ground Contact Time Balance Data............................... 25

Vertical Oscillation and Vertical Ratio Data.....................25

Tips for Missing Running Dynamics Data............................ 26

Performance Measurements.................................................... 26

Turning Off Performance Notifications................................. 26

Detecting Performance Measurements Automatically......... 26

Syncing Activities and Performance Measurements........... 26

About VO2 Max. Estimates.................................................. 26

Getting Your VO2 Max. Estimate for Running................ 26

Getting Your VO2 Max. Estimate for Cycling.................. 27

Viewing Your Predicted Race Times................................... 27

About Training Effect........................................................... 27

Heart Rate Variability and Stress Level............................... 27

Viewing Your Heart Rate Variability and Stress Level.... 27

Performance Condition........................................................ 27

Viewing Your Performance Condition............................. 28

Lactate Threshold................................................................ 28

Performing a Guided Test to Determine Your Lactate

Threshold........................................................................ 28

Getting Your FTP Estimate

Conducting an FTP Test................................................. 28

Training Status..........................................................................28

Training Status Levels......................................................... 29

Tips for Getting Your Training Status.............................. 29

Heat and Altitude Performance Acclimation........................ 29

Training Load....................................................................... 29

Training Load Focus............................................................ 29

Recovery Time..................................................................... 30

Viewing Your Recovery Time.......................................... 30

Recovery Heart Rate.......................................................30

Body Battery™..........................................................................30

Viewing the Body Battery Widget.........................................30

Tips for Improved Body Battery Data................................... 30

.................................................. 28

Pulse Oximeter............................................................. 30

Getting Pulse Oximeter Readings............................................ 30

Turning On All-Day Pulse Oximeter Readings......................... 31

Turning Off Automatic Pulse Oximeter Readings..................... 31

Turning On Pulse Oximeter Sleep Tracking............................. 31

Tips for Erratic Pulse Oximeter Data........................................ 31

Training......................................................................... 31

Setting Up Your User Profile.....................................................31

Fitness Goals....................................................................... 31

About Heart Rate Zones...................................................... 31

Setting Your Heart Rate Zones....................................... 31

Letting the Device Set Your Heart Rate Zones............... 32

Heart Rate Zone Calculations......................................... 32

Setting Your Power Zones................................................... 32

Activity Tracking........................................................................32

Auto Goal............................................................................. 32

Using the Move Alert............................................................32

Sleep Tracking..................................................................... 32

Using Automated Sleep Tracking....................................32

Using Do Not Disturb Mode............................................ 32

Intensity Minutes.................................................................. 32

Earning Intensity Minutes................................................ 33

Garmin Move IQ™............................................................... 33

Activity Tracking Settings..................................................... 33

Turning Off Activity Tracking........................................... 33

Workouts...................................................................................33

Following a Workout From Garmin Connect........................ 33

Starting a Workout............................................................... 33

About the Training Calendar................................................ 33

Using Garmin Connect Training Plans............................ 33

Adaptive Training Plans.................................................. 33

Interval Workouts...................................................................... 34

Creating an Interval Workout............................................... 34

Starting an Interval Workout................................................ 34

Stopping an Interval Workout...............................................34

PacePro Training...................................................................... 34

Downloading a PacePro Plan from Garmin Connect........... 34

Starting a PacePro Plan.......................................................34

Stopping a PacePro Plan................................................ 34

Creating a PacePro Plan on Your Watch............................ 34

Segments..................................................................................35

Strava™ Segments.............................................................. 35

Viewing Segment Details..................................................... 35

Racing a Segment............................................................... 35

Setting a Segment to Adjust Automatically.......................... 35

Using Virtual Partner®.............................................................. 35

Setting a Training Target.......................................................... 35

Cancelling a Training Target................................................ 35

Racing a Previous Activity........................................................ 35

Personal Records..................................................................... 36

Viewing Your Personal Records.......................................... 36

Restoring a Personal Record............................................... 36

ii Table of Contents

Clearing a Personal Record................................................. 36

Clearing All Personal Records............................................. 36

Clocks............................................................................ 36

Setting an Alarm....................................................................... 36

Editing an Alarm...................................................................36

Starting the Countdown Timer.................................................. 36

Deleting a Timer...................................................................36

Using the Stopwatch................................................................. 36

Adding Alternate Time Zones................................................... 37

Editing an Alternate Time Zone........................................... 37

Navigation..................................................................... 37

Saving Your Location............................................................... 37

Editing Your Saved Locations.............................................. 37

Projecting a Waypoint............................................................... 37

Navigating to a Destination....................................................... 37

Navigating to a Point of Interest............................................... 37

Points of Interest.................................................................. 37

Creating and Following a Course on Your Device.................... 37

Creating a Round-Trip Course..................................................37

Viewing or Editing Course Details............................................ 38

Using ClimbPro......................................................................... 38

Marking and Starting Navigation to a Man Overboard

Location.................................................................................... 38

Navigating with Sight 'N Go...................................................... 38

Navigating to Your Starting Point During an Activity................ 38

Viewing Route Directions..................................................... 38

Navigating to the Starting Point of a Saved Activity................. 38

Stopping Navigation................................................................. 39

Map........................................................................................... 39

Viewing the Map.................................................................. 39

Saving or Navigating to a Location on the Map................... 39

Navigating with the Around Me Feature.............................. 39

Changing the Map Theme................................................... 39

Compass...................................................................................39

Setting the Compass Heading............................................. 39

Altimeter and Barometer........................................................... 39

History........................................................................... 40

Using History............................................................................ 40

Multisport History................................................................. 40

Viewing Your Time in Each Heart Rate Zone...................... 40

Viewing Data Totals.................................................................. 40

Using the Odometer..................................................................40

Deleting History........................................................................ 40

Customizing Your Device............................................ 40

Activities and App Settings....................................................... 40

Customizing the Data Screens............................................ 41

Adding a Map to an Activity................................................. 41

Alerts.................................................................................... 41

Setting an Alert................................................................42

Activity Map Settings............................................................42

Routing Settings...................................................................42

Auto Lap...............................................................................42

Marking Laps by Distance............................................... 42

Enabling Auto Pause........................................................... 42

Enabling Auto Climb............................................................ 43

3D Speed and Distance....................................................... 43

Turning On and Off the Lap Key.......................................... 43

Using Auto Scroll................................................................. 43

Changing the GPS Setting................................................... 43

GPS and Other Satellite Systems................................... 43

UltraTrac......................................................................... 43

Power Save Timeout Settings..............................................43

Changing the Order of an Activity in the Apps List................... 43

Widgets..................................................................................... 44

Customizing the Widget Loop.............................................. 44

inReach Remote

Using the inReach Remote............................................. 44

VIRB Remote....................................................................... 45

Controlling a VIRB Action Camera.................................. 45

Controlling a VIRB Action Camera During an Activity..... 45

Using the Stress Level Widget............................................. 45

Customizing the My Day Widget.......................................... 45

Customizing the Controls Menu................................................45

Watch Face Settings.................................................................45

Customizing the Watch Face............................................... 45

Sensors Settings.......................................................................46

Compass Settings................................................................ 46

Calibrating the Compass Manually................................. 46

Setting the North Reference............................................46

Altimeter Settings................................................................. 46

Calibrating the Barometric Altimeter............................... 46

Barometer Settings.............................................................. 46

Calibrating the Barometer............................................... 46

Xero Laser Location Settings............................................... 46

Map Settings............................................................................. 47

Map Themes........................................................................ 47

Marine Map Settings............................................................ 47

Showing and Hiding Map Data............................................ 47

Navigation Settings................................................................... 47

Customizing Map Features.................................................. 47

Setting Up a Heading Bug................................................... 47

Setting Navigation Alerts......................................................47

Power Manager Settings.......................................................... 47

Customizing the Battery Saver Feature............................... 47

Customizing Power Modes.................................................. 48

Restoring a Power Mode..................................................... 48

System Settings........................................................................ 48

Time Settings....................................................................... 48

Setting Time Alerts.......................................................... 48

Syncing the Time............................................................ 48

Changing the Backlight Settings.......................................... 49

Customizing the Hot Keys....................................................49

Changing the Units of Measure........................................... 49

Viewing Device Information...................................................... 49

Viewing E-label Regulatory and Compliance Information.... 49

.................................................................. 44

Wireless Sensors......................................................... 49

Pairing Your Wireless Sensors................................................. 49

Extended Display Mode............................................................ 49

Using an Optional Bike Speed or Cadence Sensor.................. 49

Training with Power Meters...................................................... 49

Using Electronic Shifters...........................................................49

Situational Awareness.............................................................. 49

Foot Pod................................................................................... 49

Improving Foot Pod Calibration........................................... 50

Calibrating Your Foot Pod Manually.................................... 50

Setting Foot Pod Speed and Distance................................. 50

tempe™.................................................................................... 50

Club Sensors............................................................................ 50

Device Information....................................................... 50

Descent Mk2i Specifications..................................................... 50

Battery Information...............................................................50

Descent T1 Specifications........................................................ 50

Data Management.................................................................... 51

Deleting Files....................................................................... 51

Device Maintenance..................................................... 51

Device Care.............................................................................. 51

Cleaning the Device............................................................. 51

Changing the QuickFit® Bands................................................ 51

Extra Long Diving Band............................................................ 51

Metal Watch Band Adjustment................................................. 51

Table of Contents iii

Descent T1 Device Care...........................................................51

Cleaning the Transmitter......................................................51

User Replaceable Batteries...................................................... 51

Replacing the Descent T1 Battery....................................... 52

Troubleshooting........................................................... 52

My device is in the wrong language......................................... 52

Is my smartphone compatible with my device?........................ 52

My phone will not connect to the device................................... 52

Can I use my Bluetooth sensor with my watch?....................... 52

My headphones will not connect to the device......................... 52

My music cuts out or my headphones do not stay connected.. 52

Restarting Your Device............................................................. 52

Resetting All Default Settings................................................... 53

Diving........................................................................................ 53

Resetting Your Tissue Load.................................................53

Resetting the Surface Pressure........................................... 53

Updating the Transmitter Software Using Your Descent Dive

Computer............................................................................. 53

My transmitter and watch lose connection underwater........ 53

Adjusting the Transmitter Power Setting......................... 53

My transmitter battery is draining rapidly............................. 53

Acquiring Satellite Signals........................................................ 53

Improving GPS Satellite Reception......................................53

The temperature reading is not accurate.................................. 54

Maximizing the Battery Life.......................................................54

Activity Tracking........................................................................54

My daily step count does not appear................................... 54

My step count does not seem accurate............................... 54

The step counts on my device and my Garmin Connect

account don't match............................................................. 54

The floors climbed amount does not seem accurate........... 54

Getting More Information.......................................................... 54

Appendix....................................................................... 54

Data Fields................................................................................54

VO2 Max. Standard Ratings..................................................... 58

FTP Ratings.............................................................................. 59

Wheel Size and Circumference................................................ 59

Symbol Definitions.................................................................... 59

Index.............................................................................. 61

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.

Getting Started

When using your watch the first time, you should complete these tasks to set it up and get to know the basic features.

Press LIGHT to turn on the watch (Buttons, page 1).

Follow the on-screen instructions to complete the initial

setup.

During the initial setup, you can pair your smartphone with

your watch to receive notifications, sync your activities, and

more (Pairing Your Smartphone, page 2).

Charge the device (Charging the Device, page 2).

Start an activity (Starting an Activity, page 12).

Buttons

: Double tap the device to scroll through the data screens

during a dive.

Using the Watch

• Hold LIGHT to view the controls menu.

The controls menu provides quick access to frequently used functions, such as turning on do not disturb mode, saving a location, and turning the watch off.

• From the watch face, press UP or DOWN to scroll through

the widget loop. Your watch comes preloaded with widgets that provide at-a-

glance information. More widgets are available when you pair your watch with a smartphone.

• From the watch face, press START to start an activity or

open an app (Activities and Apps, page 12).

• Hold MENU to customize the watch face, adjust settings, and

pair wireless sensors.

Viewing the Controls Menu

The controls menu contains options, such as turning on do not disturb mode, locking the keys, and turning the device off. You can also open the Garmin Pay™ wallet.

NOTE: You can add, reorder, and remove the options in the controls menu (Customizing the Controls Menu, page 45).

From any screen, hold LIGHT.

LIGHT

• Press to turn the backlight on and off.

• Press to turn the device on.

• Hold to view the controls menu.

NOTE: While diving, hold functions are disabled.

MENU·UP

• Press to scroll through the widget loop and menus.

• Hold to view the menu.

NOTE: You can enable or disable this button for dive

activities (Dive Setup, page 3).

DOWN

• Press to scroll through the widget loop and menus.

• Press to scroll through the data screens during a dive.

• Hold to view the music controls from any screen.

NOTE: While diving, hold functions are disabled.

START·STOP

• Press to view the activity list and start or stop an activity.

• Press to choose an option in a menu.

• Press to view the menu during a dive.

BACK·LAP

• Press to return to the previous screen.

• Press to exit a menu during a dive.

• Press to record a lap, rest, or transition during a multisport activity.

• Hold to view the watch face from any screen.

• Hold to return to the primary data screen during a dive.

Press UP or DOWN to scroll through the options.

Enabling Airplane Mode

You can enable airplane mode to disable all wireless communications.

NOTE: You can add options to the controls menu (Customizing

the Controls Menu, page 45).

Hold LIGHT.

Select .

Viewing Widgets

Your device comes preloaded with several widgets, and more are available when you pair your device with a smartphone.

• Press UP or DOWN.

The device scrolls through the widget loop and displays summary data for each widget.

• Press START to view widget details. TIP: You can press DOWN to view additional screens for a

widget, or press START to view additional options and functions for a widget.

• From any screen, hold BACK to return to the watch face.

• If you are recording an activity, press BACK to return to the activity data pages.

Introduction 1

Customizing the Watch

• From the watch face, hold MENU to change the watch face.

• From the widget screens, hold MENU to customize the

widget options.

• From the controls menu, hold MENU to add, remove, and

reorder the controls.

• From any screen, hold MENU to change additional settings.

Default Watch Face

Alternate time zone pointer. References the 24-hour time markings on the watch (Adding Alternate Time Zones, page 37).

No-fly time remaining. References the 24-hour time markings on the watch (No-Fly Time, page 11).

Surface interval (SI) time after a dive.

Pairing Your Smartphone

To use the connected features on your watch, you must pair it directly through the Garmin Dive™ app, instead of from the Bluetooth® settings on your smartphone.

From the app store on your smartphone, install and open the

Garmin Dive app. Select an option to enable pairing mode on your watch:

• During the initial setup, select Yes when you are prompted

to pair with your smartphone.

• If you previously skipped the pairing process, hold MENU, and select Pair Phone.

Select an option to add your watch to your account:

• If this is the first time you are pairing a device with the Garmin Dive app, follow the on-screen instructions.

• If you already paired another device with the Garmin Dive app, select Add > Devices, and follow the on-screen instructions.

Charging the Device

WARNING

This device contains a lithium-ion battery. See the Important Safety and Product Information guide in the product box for

product warnings and other important information.

NOTICE

To prevent corrosion, thoroughly clean and dry the contacts and the surrounding area before charging or connecting to a computer. Refer to the cleaning instructions (Device Care,

page 51).

Pinch the sides of the charging clip.

Align the clip with the contacts on the back of the device, and

release the clip.

Plug the USB cable into a USB charging port.

Product Updates

On your computer, install Garmin Express™ (www.garmin.com

/express). On your smartphone, install the Garmin Dive app.

This provides easy access to these services for Garmin devices:

• Software updates

• Map updates

• Course updates

• Data uploads to Garmin Dive

• Product registration

Setting Up Garmin Express

Connect the device to your computer using a USB cable.

Go to www.garmin.com/express.

Follow the on-screen instructions.

Diving

Dive Warnings

WARNING

• The diving features of this device are for use by certified divers only. This device should not be used as a sole dive computer. Failure to input the appropriate dive-related information into the device can lead to serious personal injury or death.

• Make sure that you fully understand the use, displays, and limitations of your device. If you have questions about this manual or the device, always resolve any discrepancies or confusion before diving with the device. Always remember that you are responsible for your own safety.

• There is always a risk of decompression sickness (DCS) for any dive profile even if you follow the dive plan provided by the dive tables or a diving device. No procedure, diving device, or dive table will eliminate the possibility of DCS or oxygen toxicity. An individual's physiological make up can vary from day to day. This device cannot account for these variations. You are strongly advised to remain well within the limits provided by this device to minimize the risk of DCS. You should consult a physician regarding your fitness before diving.

• The dive computer can calculate your surface air consumption rate (SAC) and air time remaining (ATR). These calculations are an estimate and should not be relied on as the only source of information.

• Always use backup instruments, including a depth gauge, submersible pressure gauge, and timer or watch. You should have access to decompression tables when diving with this device.

• Perform pre-dive safety checks, such as checking proper device function and settings, display function, battery level, tank pressure, and bubble checks to check hoses for leaks.

• If a tank pressure warning or battery warning appears on the dive computer, terminate the dive immediately and safely return to the surface. Disregarding the alarm may result in serious injury or death.

• This device should not be shared between multiple users for diving purposes. Diver profiles are user specific, and using another diver's profile can result in misleading information that could lead to injury or death.

• For safety reasons, you should never dive alone. Dive with a designated buddy. You should also stay with others for an extended time after a dive, because the potential onset of

2 Diving

decompression sickness (DCS) may be delayed or triggered by surface activities.

• This device is not intended for commercial or professional dive activities. It is for recreational purposes only. Commercial or professional dive activities can expose the user to extreme depths or conditions that increase the risk of DCS.

• Do not dive with a gas if you have not personally verified its contents and input the analyzed value to the device. Failure to verify tank contents and input the appropriate gas values to the device will result in incorrect dive planning information and could result in serious injury or death.

• Diving with more than one gas mixture presents a much greater risk than diving with a single gas mixture. Mistakes related to the use of multiple gas mixtures may lead to serious injury or death.

• The transmitter is not an oxygen cleaned product. Do not use the transmitter with anything greater than 40% oxygen.

• Always ensure a safe ascent. A rapid ascent increases the risk of DCS.

• Disabling the deco lockout feature on the device can result in an increased risk of DCS, which can result in personal injury or death. Disable this feature at your own risk.

• Violating a required decompression stop may result in serious injury or death. Never ascend above the displayed decompression stop depth.

• Always perform a safety stop between 3 and 5 meters (9.8 and 16.4 feet) for 3 minutes, even if no decompression stop is required.

Dive Modes

The Descent Mk2i device supports six dive modes. Each dive mode has four phases: dive pre-check, surface display, in-dive, and post-dive.

Single-Gas: This mode allows you to dive with a single gas

blend. You can set up to 11 additional gases as backup gases.

Multi-Gas: This mode allows you to configure multiple gas

blends and switch gases during your dive. You can set the oxygen content from 5–100%. This mode supports one bottom gas, and up to 11 additional gases as decompression or backup gases.

NOTE: Backup gases are not used in no-decompression limit (NDL) and time to surface (TTS) decompression calculations until you activate them during a dive.

CCR: This mode for closed-circuit rebreather (CCR) diving

allows you to configure two partial pressure of oxygen (PO2) setpoints, closed-circuit (CC) diluent gases, and open-circuit (OC) decompression and backup gases.

Gauge: This mode allows you to dive with basic bottom timer

features. NOTE: After diving in gauge mode, the device can only be

used in gauge or apnea mode for 24 hours.

Apnea: This mode allows you to free dive with apnea-specific

dive data. This mode has a higher data refresh rate.

Apnea Hunt: This mode is similar to the Apnea dive mode, but

tuned specifically for spearfishers. This mode displays simplified in-dive data, and disables start and stop tones.

Using the Pool Dive Mode

When the device is in pool dive mode, the tissue load and decompression lockout features function normally, but dives are not saved to the dive log.

Hold LIGHT to view the controls menu.

Select .

The pool dive mode turns off automatically at midnight.

Dive Setup

You can customize the dive settings based on your needs. Not all settings are applicable for all dive modes. You can also edit the settings before you start a dive.

Hold MENU, and select Dive Setup. Gases: Sets the gas blends used in the gas dive modes (Setting

Up Your Breathing Gases, page 3). You can have up to

twelve gases for each gas dive mode.

Conservatism: Sets the level of conservatism for

decompression calculations. Higher conservatism provides a shorter bottom time and a longer ascent time. The Custom option allows you to set a custom gradient factor.

NOTE: Make sure you understand gradient factors before entering a custom level of conservatism.

Air Integration: Allows you to pair Descent T1 devices and

configure the data screens (Air Integration, page 4).

Water Type: Allows you to select the water type. PO2: Sets the partial pressure of oxygen (PO2) thresholds, in

bar, for decompression, warnings, and critical alerts (Setting

PO2 Thresholds, page 4).

Alerts: Allows you to set tone, vibration, or silent alerts for depth

and time. You can enable different alerts for different dive modes.

Apnea Surf. Alert: Allows you to set alerts for apnea surface

intervals.

Safety Stop: Allows you to change the safety stop duration. End Dive Delay: Allows you to set the length of time before the

device ends and saves a dive after surfacing.

CCR Setpoints: Allows you to set high and low PO2 setpoints

for closed-circuit rebreather (CCR) dives (Setting CCR

Setpoints, page 4).

Backlight: Allows you to adjust the backlight settings for dive

activities. You can enable the backlight throughout the dive or only when you are at depth.

Heart Rate: Allows you to enable or disable a heart rate monitor

for dives. The Stored Strap Data option allows you enable a chest heart rate monitor, such as the HRM-Swim™ or HRM-Tri™ device, that stores heart rate data with the dive. You can view chest heart rate monitor data in the Garmin Dive app after you complete the dive.

Double Tap to Scroll: Allows you to double tap the device to

scroll through the dive data screens. If you notice accidental scrolling, you can use the Sensitivity option to adjust the responsiveness.

UP Key: Allows you to disable the UP button during dive

activities to prevent inadvertent button presses.

NOTE: This setting is disabled by default.

Deco Lockout: Allows you to disable the decompression

lockout feature. This feature prevents single-gas and multigas dives for 24 hours if you violate a decompression ceiling for more than three minutes.

NOTE: You can still disable the decompression lockout feature after violating a decompression ceiling.

Setting Up Your Breathing Gases

You can enter up to twelve gases for each gas dive mode. Decompression calculations include your decompression gases, but do not include your backup gases.

Hold MENU.

Select Dive Setup > Gases.

Select a dive mode.

Select the first gas in the list.

Diving 3

For single-gas or multi-gas dive modes, this is the bottom gas. For the closed-circuit rebreather (CCR) dive mode, this is the diluent gas.

Select Oxygen, and enter the oxygen percentage of the gas

blend. Select Helium, and enter the helium percentage of the gas

blend. The device calculates the remaining percentage as the

nitrogen content. Press BACK.

Select an option:

NOTE: Not all options are available for all dive modes.

• Select Add Backup, and enter the oxygen and helium

percentage for your backup gas.

• Select Add New, enter the oxygen and helium

percentage, and select Mode to set the intended use for the gas, such as decompression or backup.

NOTE: For the multi-gas dive mode, you can select Set as Travel Gas to set a decompression gas as your intended

gas for descending.

Setting PO2 Thresholds

You can configure the partial pressure of oxygen (PO2) thresholds, in bars, for decompression, warning, and critical alerts.

Hold MENU.

Select Dive Setup > PO2.

Select an option:

• Select Deco PO2 to set the threshold that you can reach

before you should begin your ascent and switch to the decompression gas with the highest percentage of oxygen.

NOTE: The device does not switch gases for you automatically. You must select the gas.

• Select PO2 Warning to set the threshold for the highest

oxygen concentration level that you are comfortable reaching.

• Select PO2 Critical to set the threshold for the maximum

oxygen concentration level that you should reach.

Enter a value.

If you reach a threshold value during a dive, the device displays an alert message.

Setting CCR Setpoints

You can configure the high and low partial pressure of oxygen (PO2) setpoints for closed-circuit rebreather (CCR) dives.

Hold MENU.

Select Dive Setup > CCR Setpoints.

Select an option:

• To configure the lower PO2 setpoint, select Low Setpoint.

• To configure the upper PO2 setpoint, select High

Setpoint.

Select Mode.

Select an option:

• To automatically change the setpoint based on your

current depth, select Auto. NOTE: For example, if you descend through the high

setpoint depth or ascend through the low setpoint depth, the PO2 threshold switches to the high or low setpoint, respectively. Automatic setpoint depths must be at least

6.1 m (20 ft.) apart.

• To manually change setpoints during a dive, select

Manual.

NOTE: If you manually change setpoints within 1.8 m (6

ft.) of an automatic switch depth, then automatic setpoint switching is disabled until you are more than 1.8 m (6 ft.) above or below the automatic switch depth. This prevents unintended setpoint switching.

Select PO2, and enter a value.

Air Integration

The Descent Mk2i dive computer can be used with a paired Descent T1 transmitter to view tank pressure, estimated air time remaining, and estimated gas consumption. You can also view the tank pressure and battery status for up to four other divers in your group.

Installation and Setup

CAUTION

To ensure proper setup and best performance, it is strongly recommended that you complete the first time installation and setup at a dive shop. You should fully test the transmitter installation above and below water before using it during a dive.

Transmitter Position Tips

The transmitter communicates wirelessly with your compatible dive computer. On the surface, it uses ANT® technology. Underwater, it uses a sonar signal. Your body, drysuit, and dive equipment can obstruct the signal, particularly while underwater. For the best reception, all transmitters in your group should have clear lines of sight to the dive computer. To help prevent blocking the signal with your body or equipment, you should follow these tips.

• You should install the transmitter at least 7 cm (3 in.) from your body.

• You should install the transmitter on the same side of the tank as the wrist wearing your dive computer. For example, if you wear your dive computer on your left wrist, you should install the transmitter on the left side of the tank regulator.

• For the best reception, you should wear the tank high on your back. This allows the transmitter to have a clear line of sight over your shoulders.

• If you wear your tank inverted with the regulator at the bottom, you can use a high-pressure hose to relocate the transmitter to have a clear line of sight over your shoulders.

• If you lose the signal from your transmitter, you should move your arm until the signal is restored.

• If you lose the signal from another diver, you should change your body position until the signal is restored. If your body is between the dive computer and another diver, it may obstruct the signal from that diver's transmitter.

4 Diving

Installing the Transmitter on Your Tank Regulator

WARNING

Always use the pre-installed flow restrictor when using the transmitter directly attached to your regulator. Always use the included air spool when connecting the transmitter to a high pressure hose extension (Installing the Transmitter on a High

Pressure Hose Extension, page 5). Using the transmitter

without either the flow restrictor or air spool could result in serious injury or death from an air pressurization failure.

Before you install the transmitter on your tank regulator, you should read the transmitter position tips and choose the port position that provides the best line of sight to the dive computer.

To install the transmitter, you need a 5/8 in. (16 mm) open-ended wrench.

The transmitter connects to a high pressure output port of the first-stage regulator.

Confirm the regulator is depressurized and detached from a

scuba cylinder. Remove the port plug from the high pressure output port of

the first-stage regulator. Confirm the flow restrictor is installed in the transmitter.

Screw the transmitter onto the high pressure output port until

you feel resistance.

NOTICE

To prevent damage to the transmitter and possible loss of function, do not overtighten. Do not use the transmitter housing to tighten or loosen the transmitter.

Do not grip the regulator or the transmitter to move, carry, or adjust the tank.

Installing the Transmitter on a High Pressure Hose Extension

WARNING

Always use the pre-installed flow restrictor when using the transmitter directly attached to your regulator (Installing the

Transmitter on Your Tank Regulator, page 5). Always use the

included air spool when connecting the transmitter to a high pressure hose extension. Using the transmitter without either the flow restrictor or air spool could result in serious injury or death from an air pressurization failure.

Before you install the transmitter on a high pressure hose extension certified to the EN 250:2014 standard, you should read the transmitter position tips and choose a position that provides the best line of sight to the dive computer.

To install the transmitter, you need two 5/8 in. (16 mm) openended wrenches and a small flat screwdriver or flat-nose pliers.

The transmitter can connect to a high pressure hose extension from the high pressure output port of the first-stage regulator.

Use a screwdriver or pliers to carefully remove the flow

restrictor from the transmitter.

NOTICE

Use care when removing the flow restrictor to avoid damaging the device.

Insert the large end of the air spool into the transmitter.

WARNING

Verify the installed transmitter does not physically interfere with any hoses or other tank assemblies.

Use a 5/8 in. (16 mm) wrench to tighten the transmitter.

Diving 5

Confirm the regulator is depressurized and detached from a

scuba cylinder. Remove the port plug from the high pressure output port of

the first-stage regulator. Connect a high pressure hose extension to the high pressure

output port of the first-stage regulator. Screw the transmitter onto the high pressure hose extension

until you feel resistance.

WARNING

Verify the installed transmitter does not physically interfere with any hoses or other tank assemblies.

Use two 5/8 in. (16 mm) wrenches to tighten the transmitter,

placing one wrench on the transmitter and one wrench on the hose fitting.

NOTICE

To prevent damage to the transmitter and possible loss of function, do not overtighten. Do not use the transmitter housing to tighten or loosen the transmitter.

Do not grip the regulator or the transmitter to move, carry, or adjust the tank.

Ensure the connection between the transmitter and hose

fitting is secure before using the device.

You must remove the air spool and reinstall the flow restrictor before installing the transmitter on your tank regulator.

Pairing the Transmitter with a Descent Mk2i Dive Computer

To pair the transmitter, you must have a pressurized tank and regulator.

The Descent T1 can transmit air pressure data to a Descent Mk2i dive computer.

Before you use the transmitter for the first time, you must pair it with the dive computer. Out of the box, the transmitter is in low power mode. You must wake the device from low power mode to complete the pairing process.

NOTE: If a transmitter was packaged with your dive computer, they are already paired.

Install the transmitter on the first-stage regulator (Installing

the Transmitter on Your Tank Regulator, page 5).

Gradually open the tank valve to pressurize the first-stage

regulator. When the transmitter detects pressure, it wakes from low

power mode. The transmitter plays a tone when it wakes from low power mode and is ready to pair.

On the Descent Mk2i dive computer, hold MENU, and select

Dive Setup > Air Integration > Transmitters > Add New.

The dive computer starts searching and displays a list of nearby transmitters.

From the list of transmitters, select the transmitter ID you

want to pair. The transmitter ID is printed on the housing.

When the pairing process is complete, Connected appears on the dive computer screen. The transmitter begins sending tank pressure data, and it is ready to use on a dive. The next time the transmitter and dive computer are turned on and within wireless range, they connect automatically when you start a dive.

If you are diving with a group, you can pair up to 5 Descent T1 transmitters with the dive computer.

Selecting Paired Transmitters to View on Your Dive Data Screens

You can view two paired transmitters at-a-glance on the primary dive data screen. You can customize which paired transmitters appear on the screen. By default, the first and second transmitters that you pair appear.

Hold MENU.

Select Dive Setup > Air Integration > Display Setup.

Select a field to customize.

Select a paired transmitter.

Transmitter Settings

You can customize the settings for paired transmitters prior to a dive.

On the paired Descent dive computer, hold MENU, select Dive Setup > Air Integration > Transmitters, and select a transmitter.

Status: Enables a connection to the transmitter, and shows

current connection status.

Identify: Plays a tone on the selected paired transmitter. This

helps you to identify the transmitter without needing to look at the transmitter ID printed on the transmitter housing.

Units: Sets the pressure units for your tank. The device defaults

to psi if your depth setting is in feet, and bar if your depth setting is in meters.

Working Pressure: Sets how much pressure the tank has when

full. This value is used to determine the upper end of the pressure gauge, and to calculate respiratory minute volume (RMV) for tanks using psi units.

Reserve Pressure: Sets the threshold values for reserve

pressure and critical pressure alerts to appear on the dive computer.

Volume: Allows you to enter the air volume of the tank. You can

use the Reset Volume option if you move the transmitter to a different size tank.

NOTE: This value is required to calculate volumetric surface air consumption (SAC) and respiratory minute volume (RMV) (Selecting the Gas Consumption Rate Metric, page 7).

SAC/RMV/ATR: Enables the transmitter to be included in

volumetric surface air consumption (SAC), respiratory minute volume (RMV), and air time remaining (ATR) estimates (Including Transmitters in Gas Consumption Calculations,

page 7).

Set Transmit Power: Allows you to adjust the power setting if

your transmitter is losing connection with the paired dive computer underwater.

About: Displays the transmitter ID, software version, and battery

status.

Name: Allows you to enter an easily identifiable name for the

transmitter.

Remove: Allows you to remove a paired transmitter.

6 Diving

Selecting the Gas Consumption Rate Metric

Hold MENU.

Select Dive Setup > Air Integration > Display Setup > Gas

Consumption Rate.

Select an option.

NOTE: The dive computer can estimate volumetric surface

air consumption (SAC) or respiratory minute volume (RMV) only if the air volume of the tank is entered in the dive computer (Transmitter Settings, page 6). The dive computer can estimate pressure-based surface air consumption (PSAC) with or without the air volume of the tank.

Including Transmitters in Gas Consumption Calculations

Gas consumption and air time remaining estimates are calculated using the tank pressure from the included transmitters. By default, the first transmitter that you pair with your compatible dive computer is included. You can include additional paired transmitters in gas consumption calculations.

Hold MENU.

Select Dive Setup > Air Integration > Transmitters.

Select a paired transmitter.

Select the SAC/RMV/ATR toggle switch to include the

transmitter in gas consumption calculations. If necessary, repeat steps 2 through 4 to include additional

paired transmitters in gas consumption calculations.

Dive compass: Allows you to view the compass and set a

directional heading to aid with underwater navigation (Navigating with the Dive Compass, page 8).

Customizable data screen: Displays additional dive data and

physiological information, including the time of day, battery level, and your heart rate. You can edit the gauges and the first five data fields (Customizing the Data Screens,

page 41).

The time to surface (TTS) decompression calculation.

Transmitters data screen: Displays information about paired

Descent T1 transmitters (Viewing the Transmitter Data

Screens, page 9).

CCR Data Screens

Dive Data Screens

You can press DOWN or double-tap the device to scroll through the data screens.

In the activity settings, you can reorder the default data screens, add a dive stopwatch, and add custom data screens (Customizing the Data Screens, page 41). You can customize the data fields on some of the data screens.

Single-Gas and Multi-Gas Data Screens

Primary data screen: Displays the main dive data, including

your breathing gas and rate of ascent or decent.

Your partial pressure of oxygen (PO2) level.

Your nitrogen (N2) and helium (He) tissue load level.

Green: 0 to 79% tissue load. Yellow: 80 to 99% tissue load. Red: 100% or greater tissue load.

Your rate of descent or ascent.

Green: Good. Ascent is less than 7.9 m (26 ft.) per min. Yellow: Moderately high. Ascent is between 7.9 and 10.1 m

(26 and 33 ft.) per min.

Red: Too high. Ascent is greater than 10.1 m (33 ft.) per

min.

Primary data screen: Displays the main dive data, including

your breathing gas and rate of ascent or decent.

Indicates whether closed-circuit (CC) or open-circuit (OC) diving is active.

Your partial pressure of oxygen (PO2) level.

Your nitrogen (N2) and helium (He) tissue load level.

Green: 0 to 79% tissue load. Yellow: 80 to 99% tissue load. Red: 100% or greater tissue load.

Your rate of descent or ascent.

Green: Good. Ascent is less than 7.9 m (26 ft.) per min. Yellow: Moderately high. Ascent is between 7.9 and 10.1 m

(26 and 33 ft.) per min.

Red: Too high. Ascent is greater than 10.1 m (33 ft.) per

min.

Dive compass: Allows you to view the compass and set a

directional heading to aid with underwater navigation (Navigating with the Dive Compass, page 8).

Customizable data screen: Displays additional dive data and

physiological information, including the time of day and battery level. You can edit the gauges and the first five data fields (Customizing the Data Screens, page 41).

The time to surface (TTS) decompression calculation.

Your central nervous system (CNS) oxygen toxicity level.

Green: 0 to 79% CNS oxygen toxicity. Yellow: 80 to 99% CNS oxygen toxicity. Red: 100% or greater CNS oxygen toxicity.

Your current oxygen toxicity units (OTU).

Green: 0 to 249 OTU. Yellow: 250 to 299 OTU. Red: 300 or greater OTU.

Transmitters data screen: Displays information about paired

Descent T1 transmitters (Viewing the Transmitter Data

Screens, page 9).

Diving 7

Gauge Data Screens

Dive stopwatch: Displays the bottom time stopwatch; current,

maximum, and average depth; and rate of ascent or decent (Using the Dive Stopwatch, page 8).

Dive compass: Allows you to view the compass and set a

directional heading to aid with underwater navigation (Navigating with the Dive Compass, page 8).

Customizable data screen: Displays additional dive data and

physiological information, including the time of day, battery level, and your heart rate. You can edit the gauges and the first five data fields (Customizing the Data Screens,

page 41).

Transmitters data screen: Displays information about paired

Descent T1 transmitters (Viewing the Transmitter Data

Screens, page 9).

Apnea and Apnea Hunt Data Screens

In-dive screen: Displays the information about the current dive,

including the elapsed time, current and maximum depth, heart rate data, and rate ascent or descent.

Starting a Dive

From the watch face, press START.

Select a dive mode (Dive Modes, page 3).

If necessary, press DOWN to edit the dive settings, such as

the gases, water type, and alerts (Dive Setup, page 3). Wait with your wrist out of the water until the device acquires

GPS signals and the status bar turns green (optional). The device requires GPS signals to save your dive entry

location. Press START until the primary dive data screen appears.

Descend to start your dive.

The activity timer starts automatically when you reach a depth of 1.2 m (4 ft.).

NOTE: If you start a dive without selecting a dive mode, the device uses the most recently used dive mode and settings.

Select an option:

• Press DOWN to scroll through the data screens and dive

compass. TIP: You can also double tap the device to scroll through

the screens.

• Press START to view the in-dive menu.

When you ascend to 1 m (3.3 ft.), the End Dive Delay timer begins counting down (Dive Setup, page 3). When the timer elapses, the device automatically ends and saves the dive. You should keep your wrist out of the water while the device saves your dive exit location.

Navigating with the Dive Compass

During a single-gas, multi-gas, closed-circuit rebreather, or

gauge dive, scroll to the dive compass.

The compass indicates your directional heading . Press START to set the heading.

Surface interval screen: Displays the current surface interval

time, as well as the elapsed time, maximum depth, and temperature for your last apnea dive.

Time of day screen: Displays the time of day and your heart

rate data.

Map: Displays your current location on the map (Diving with the

Map, page 10).

The compass indicates deviations from the set heading . Press START, and select an option:

• To reset the heading, select Reset Heading.

• To change the heading by 180 degrees, select Set to

Recip.. NOTE: The compass indicates the reciprocal heading with

a red mark.

• To set to a 90-degree heading left or right, select Set to

90L or Set to 90R.

• To clear the heading, select Clear Heading.

Using the Dive Stopwatch

TIP: You can add a simplified stopwatch screen to any of the

gas dive modes (Customizing the Data Screens, page 41).

Start a Gauge dive.

Scroll to the stopwatch screen.

8 Diving

Press START, and select Reset Avg. Depth to set the

average depth to your current depth. Press START, and select Start Stopwatch.

Select an option:

• To stop using the stopwatch, press START, and select Stop Stopwatch.

• To restart the stopwatch, press START, and select Reset Stopwatch.

Viewing the Transmitter Data Screens

Press DOWN to view the transmitter data screen.

NOTE: The device does not switch gases for you

automatically. You must select the gas.

Switching Between CC and OC Diving for a Bailout Procedure

During a closed-circuit rebreather (CCR) dive, you can switch between closed-circuit (CC) and open-circuit (OC) diving while you perform a bailout procedure.

Start a CCR dive.

Press START.

Select Switch to OC.

The dividing lines on the data screens turn red, and the device switches the active breathing gas to your OC decompression gas.

NOTE: If you have not set up an OC decompression gas, the device switches to your diluent gas.

If necessary, press START, and select Gas to manually

switch to a backup gas. Press START, and select Switch to CC to switch back to CC

diving.

Performing a Safety Stop

You should perform a safety stop during every dive to help reduce the risk of decompression sickness.

After a dive of at least 11 m (35 ft.), ascend to 5 m (15 ft.).

Safety stop information appears on the data screens.

The gas consumption estimate for the selected transmitters.

NOTE: You can customize the transmitters used for gas calculations (Including Transmitters in Gas Consumption

Calculations, page 7).

The air time remaining (ATR) estimate for the selected transmitters.

Your primary and secondary transmitters and their tank pressure values.

NOTE: You can customize which transmitters are displayed (Selecting Paired Transmitters to View on Your Dive Data

Screens, page 6).

From the transmitter data screen, press START to view

additional paired transmitters in the network.

Switching Gases During a Dive

Start a single-gas, multi-gas, or closed-circuit rebreather

(CCR) dive. Select an option:

• Press START, select Gas, and select a backup or decompression gas.

NOTE: If necessary, you can select Add New and enter a new gas.

• Dive until you reach the Deco PO2 threshold (Setting PO2

Thresholds, page 4).

The device prompts you to switch to the gas with the highest percentage of oxygen.

Your depth relative to the surface. As you ascend, your position moves upward toward the safety

stop depth .

The safety stop ceiling depth.

The safety stop timer. When you are within 1 m (5 ft.) of the ceiling depth, the timer

starts counting down.

Stay within 2 m (8 ft.) of the safety stop ceiling depth until the

safety stop timer reaches zero. NOTE: If you ascend more than 3 m (8 ft.) above the safety

stop ceiling depth, the safety stop timer pauses, and the device alerts you to descend below the ceiling depth. If you descend below 11 m (35 ft.), the safety stop timer resets.

Continue ascending to the surface.

Performing a Decompression Stop

You should always perform all the required decompression stops during a dive to help reduce the risk of decompression sickness. Missing a decompression stop adds significant risk.

When you exceed the no-decompression limit (NDL) time,

begin your ascent. Decompression stop information appears on the data

screens.

Diving 9

Your depth relative to the surface. As you ascend, your position moves upward toward the required

decompression stop depth . The empty segments represent cleared stops. You may

clear a stop before ascending to it.

The decompression stop ceiling depth.

The decompression stop timer.

Stay within 0.6 m (2 ft.) of the decompression stop ceiling

depth until the decompression stop timer reaches zero. NOTE: If you ascend more than 0.6 m (2 ft.) above the

decompression stop ceiling depth, the decompression stop timer pauses, and the device alerts you to descend below the ceiling depth. The depth and ceiling depth flash red until you are within the safe margin.

Continue ascending to the surface.

Diving with the Map

You can view your dive entry and exit locations on the map during apnea surface intervals.

TIP: You can view map data for all dive modes in the dive log widget and in the Garmin Dive app.

During an apnea dive activity, scroll to the map.

Press START, and select an option:

• To pan or zoom the map, select Pan/Zoom. TIP: You can press START to toggle between panning up

and down, panning left and right, or zooming. You can hold START to select the point indicated by the crosshairs.

• To mark your location, select Save Location.

TIP: You can press DOWN to change the icon.

Viewing the Surface Interval Widget

The widget displays your surface interval time, tissue load, and central nervous system (CNS) oxygen toxicity percentage.

From the watch face, press UP or DOWN to view the surface

interval widget. Press START to view your oxygen toxicity units (OTU) and

CNS percentage. NOTE: The OTU accumulated during a dive expire after 24

hours. Press DOWN to view your tissue load details.

Viewing the Dive Log Widget

The widget displays summaries of your recently recorded dives.

From the watch face, press UP or DOWN to view the dive log

widget. Press START to view your most recent dive.

Select an option:

• Press START to view more details.

• Press DOWN > START to view a different dive.

Press DOWN.

Select an option:

• To view additional information about the activity, select All Stats.

• To view additional information about one of multiple apnea

dives in the activity, select Dives, and select a dive.

• To view the activity on a map, select Map. NOTE: The device shows your entry and exit locations if

you waited for GPS signals before and after the dive.

• To save a dive entry or exit location, select Save Location.

• To view the depth profile of the activity, select Depth Profile.

• To view the temperature profile of the activity, select Temperature Profile.

• To view the gases you used, select Gas Switches.

Dive Planning

You can plan for future dives using your device. The device can calculate no-decompression limit (NDL) times or create decompression plans. When planning a dive, the device uses your residual tissue load from recent dives in the calculations.

Calculating NDL Time

You can calculate the no-decompression limit (NDL) time or maximum depth for a future dive. These calculations are not saved or applied to your next dive.

Press START.

Select Plan Dive > Compute NDL.

Select an option:

• To calculate NDL based on your current tissue load, select Diving Now.

• To calculate NDL based on your tissue load at a future time, select Enter Surf. Interval, and enter your surface interval time.

Enter an oxygen percentage.

Select an option:

• To calculate the NDL time, select Enter Depth, and enter the planned depth for your dive.

• To calculate the maximum depth, select Enter Time, and enter your planned dive time.

The NDL countdown clock, depth, and maximum operating depth (MOD) appear.

Press DOWN.

Select an option:

• To exit, select Done.

• To add intervals to your dive, select Add Repeat Dive, and follow the on-screen instructions.

Creating a Decompression Plan

You can create open-circuit decompression plans and save them for future dives.

Press START.

Select Plan Dive > Deco Plans > Add New.

Enter a name for the decompression plan.

Select an option:

• To enter the maximum partial pressure of oxygen in bars, select PO2.

NOTE: The device uses the PO2 value for gas switching.

• To enter your level of conservatism for decompression calculations, select Conservatism.

• To enter your gas blends, select Gases.

• To enter the maximum dive depth, select Bottom Depth.

• To enter the time at the bottom depth, select Bottom Time.

Select Save.

10 Diving

Viewing and Applying a Decompression Plan

You can replace the current single-gas or multi-gas dive settings with the settings from a decompression plan.

Press START.

Select Plan Dive > Deco Plans.

Select a decompression plan.

If necessary, select View to view the decompression plan,

then press BACK. Select Apply to use the decompression plan settings for the

single-gas or multi-gas dive mode.

Editing a Decompression Plan

Press START.

Select Plan Dive > Deco Plans.

Select a decompression plan.

Select an option:

• To change the decompression plan details, select Edit.

• To edit the name of the decompression plan, select

Rename.

Edit the information.

Deleting a Decompression Plan

Press START.

Select Plan Dive > Deco Plans.

Select a decompression plan.

Select Delete > Yes.

No-Fly Time

After a dive, appears on the default watch face, along with a no-fly time estimate in hours (Default Watch Face, page 2). You should not fly in an airplane during this time. The default no-fly time after a dive is 24 hours. After a gauge dive or a dive that violated the decompression plan, the no-fly time is set to 48 hours.

TIP: You can add the no-fly indicator to a custom watch face (Customizing the Watch Face, page 45).

Altitude Diving

At higher altitudes, the atmospheric pressure is lower, and your body contains a larger amount of nitrogen than it would at the start of a dive at sea level. The device accounts for altitude changes automatically using the barometric pressure sensor. The absolute pressure value used by the decompression model is not affected by the altitude or the gauge pressure displayed on the watch.

Tips for Wearing the Device with an Exposure Suit

• Use the extra long silicone diving band to wear the device over a thick exposure suit.

• Use the extension on the titanium watch band to increase the length of the band.

• For accurate heart rate measurements, make sure that the device stays in contact with your skin and does not bump into other wrist-worn devices (Wearing the Device, page 23).

• If you are wearing the device over an exposure suit, turn off the wrist-based heart rate monitor to increase battery life (Turning Off the Wrist-based Heart Rate Monitor, page 24).

Dive Alerts

Alert Message Cause Device Action

None You completed the

None Your partial pressure of

%1 OTU accumulated. End your dive now.

250 OTU accumulated.

Approaching Deco Stop

Approaching NDL You are at 80% of your

Ascending too fast. Slow your ascent.

Battery critically low. End your dive now.

Battery is low. Less than 20% battery

CNS toxicity at %1%. End your dive now.

CNS toxicity at 80%.

Decompression Cleared

Descend below deco ceiling.

Descend to complete safety stop.

decompression stop.

oxygen (PO2) value is above the specified warning value.

Your oxygen toxicity units are above the safe limit. During a dive, "%1" is replaced with the number of units accumulated.

Your oxygen toxicity units (OTU) are at 80% of the safe limit (250 units).

You are within one stop interval (3 m or 9.8 ft.) of the decompression stop depth.

tissue load.

You are ascending faster than 9.1 m/min. (30 ft./min.) for more than 5 seconds.

Less than 10% battery power remains.

power remains.

Your CNS oxygen toxicity is too high. During a dive, "%1" is replaced with your current CNS percentage.

Your central nervous system (CNS) oxygen toxicity is at 80% of the safe limit.

You completed all decompression stops.

You are more than

0.6 m (2 ft.) above the decompression ceiling.

You are more than 2 m (8 ft.) above the safety stop ceiling.

The decompression stop depth and time flash blue for five seconds.

Your PO2 value flashes yellow.

The alert appears every two minutes, up to three times.

None

The alert appears when the device is below 10% battery power and on the dive pre-check screen for your next dive.

The alert appears when the device is below 20% battery power and on the dive pre-check screen for your next dive.

The alert appears every two minutes, up to three times.

The alert appears during a dive and on the dive pre-check screen for your next dive.

None

The current depth and stop depth flash red.

If you remain above the decompression ceiling for more than three minutes, the decompression lockout feature goes into effect.

The current depth and stop depth flash yellow.

Diving 11

Alert Message Cause Device Action

Failed to read depth sensor. End your dive now.

NDL exceeded. Decompression now required.

PO2 is high. Ascend or switch to lower O2 gas.

PO2 is low. Descend or switch to higher O2 gas.

Safe to switch to %1. Switch now?

Safety Stop Cleared

This pool dive will not be saved to the dive log.

The device has no depth sensor data.

You have exceeded your no decompression limit (NDL) time.

Your PO2 value is above the specified critical value.

Your PO2 value is below 0.18 bar.

In a multi-gas dive, a gas with a higher oxygen content is now safe to breathe.

You completed the safety stop.

The device is in pool dive mode.

Use a backup dive computer or dive plan and end your dive. Call Garmin Product Support.

None

Your PO2 value flashes red.

The alert appears every 30 seconds, up to three times, until you ascend to a safe level or switch gases.

If you are within the first two minutes of your dive, your PO2 value flashes yellow. Otherwise, your PO2 value flashes red.

The alert appears every 30 seconds, up to three times, until you descend to a safe level or switch gases.

You can switch gases now, or wait to switch gases later in the dive.

None

The device will not save the current dive to the dive log.

Transmitter Alerts

Alert Message

None Your paired dive computer

%1 is below reserve pressure.

%1 pressure is critically low.

%1 has a low battery.

NO COMMS Your paired dive computer

Enabling Lost Transmitter Alerts

Your paired dive computer can lose communication with the transmitter when the transmitter is out of range, when the transmitter signal is blocked by your body or that of another

Cause Device Action

has lost communication with the transmitter for 30 seconds.

Your tank pressure is below the reserve pressure level. "%1" is replaced with the transmitter name.

Your tank pressure is below the critical pressure level. "%1" is replaced with the transmitter name.

Fewer than 20 hours of dive time remain. "%1" is replaced with the transmitter name.

has lost communication with the transmitter for 60 seconds.

The tank pressure value flashes yellow.

The tank pressure value turns yellow.

The paired dive computer vibrates and plays a warning tone.

The tank pressure value flashes red.

The paired dive computer vibrates and plays a warning tone.

The transmitter name flashes BATT. LOW when the battery is critically low.

The paired dive computer vibrates and plays a warning tone.

The transmitter name flashes NO COMMS, dashed lines replace the tank pressure value, and the tank pressure value flashes red.

The paired dive computer vibrates and plays a warning tone if connection alerts are enabled.

diver, and when the transmitter loses battery power. You can enable an alert that notifies you when your paired dive computer has lost communication with the transmitter for 60 seconds.

On the paired dive computer, hold MENU.

Select Dive Setup > Air Integration > Connection Alert.

Dive Terminology

Air time remaining (ATR): The time you may remain at the

current depth until an ascent at 9 m/min. (30 ft./min.) would result in surfacing with the reserve pressure.

Central nervous system (CNS): A measure of central nervous

system oxygen toxicity caused by exposure to increased partial pressure of oxygen (PO2) while diving.

Closed-circuit rebreather (CCR): A diving mode used for dives

performed with a rebreather that recirculates exhaled gas and removes carbon dioxide.

Maximum operating depth (MOD): The greatest depth at which

a breathing gas can be used before the partial pressure of oxygen (PO2) exceeds the safe limit.

No decompression limit (NDL): A dive that does not require

decompression time while ascending to the surface.

Oxygen toxicity units (OTU): A measure of pulmonary oxygen

toxicity caused by exposure to increased partial pressure of oxygen (PO2) while diving. One OTU is equivalent to breathing 100% oxygen at 1 ATM for 1 minute.

Partial pressure of oxygen (PO2): The pressure of the oxygen

in the breathing gas, based on depth and oxygen percentage.

Pressure-based surface air consumption (PSAC): The

change in pressure over time, normalized to 1 ATM.

Respiratory minute volume (RMV): The change in gas volume

at ambient pressure over time.

Surface interval (SI): The amount of time that has elapsed

since the completion of the last dive.

Time to surface (TTS): The estimated amount of time it will take

to ascend to the surface, including decompression and safety stops.

Volumetric surface air consumption (SAC): The change in

gas volume over time, normalized to 1 ATM.

Activities and Apps

Your device can be used for indoor, outdoor, athletic, and fitness activities. When you start an activity, the device displays and records sensor data. You can save activities and share them with the Garmin Connect™ community.

You can also add Connect IQ™ activities and apps to your device using the Connect IQ app (Connect IQ Features,

page 21).

For more information about activity tracking and fitness metric accuracy, go to garmin.com/ataccuracy.

Starting an Activity

When you start an activity, GPS turns on automatically (if required).

From the watch face, press START.

Select an option:

• Select an activity from your favorites.

• Select , and select an activity from the extended activity

list.

If the activity requires GPS signals, go outside to an area with

a clear view of the sky, and wait until the device is ready. The device is ready after it establishes your heart rate,

acquires GPS signals (if required), and connects to your wireless sensors (if required).

12 Activities and Apps

Press START to start the activity timer.

The device records activity data only while the activity timer is running.

Tips for Recording Activities

• Charge the device before starting an activity (Charging the

Device, page 2).

• Press LAP to record laps, start a new set or pose, or advance to the next workout step.

• Press UP or DOWN to view additional data pages.

Changing the Power Mode

You can change the power mode to extend battery life during an activity.

During an activity, hold MENU.

Select Power Mode.

Select an option.

The watch displays the hours of battery life gained with the selected power mode.

Stopping an Activity

Press STOP.

Select an option:

• To resume your activity, select Resume.

• To save the activity and return to watch mode, select

Save > Done.

• To suspend your activity and resume it at a later time,

select Resume Later.

• To mark a lap, select Lap.

• To navigate back to the starting point of your activity along

the path you traveled, select Back to Start > TracBack. NOTE: This feature is available only for activities that use

GPS.

• To navigate back to the starting point of your activity by

the most direct path, select Back to Start > Route. NOTE: This feature is available only for activities that use

GPS.

• To discard the activity and return to watch mode, select

Discard > Yes.

NOTE: After stopping the activity, the device saves it

automatically after 30 minutes.

Adding or Removing a Favorite Activity

The list of your favorite activities appears when you press START from the watch face, and it provides quick access to the activities you use most. You can add or remove favorite activities at any time.

Hold MENU.

Select Activities & Apps.

Your favorite activities appear at the top of the list. Select an option:

• To add a favorite activity, select the activity, and select

Set as Favorite.

• To remove a favorite activity, select the activity, and select

Remove from Favorites.

Creating a Custom Activity

From the watch face, press START.

Select Add.

Select an option:

• Select Copy Activity to create your custom activity

starting from one of your saved activities.

• Select Other to create a new custom activity. If necessary, select an activity type.

Select a name or enter a custom name.

Duplicate activity names include a number, for example: Bike(2).

Select an option:

• Select an option to customize specific activity settings. For example, you can customize the data screens or auto features.

• Select Done to save and use the custom activity.

Select Yes to add the activity to your list of favorites.

Indoor Activities

The Descent device can be used for training indoors, such as running on an indoor track or using a stationary bike. GPS is turned off for indoor activities.

When running or walking with GPS turned off, speed, distance, and cadence are calculated using the accelerometer in the device. The accelerometer is self-calibrating. The accuracy of the speed, distance, and cadence data improves after a few outdoor runs or walks using GPS.

TIP: Holding the handrails of the treadmill reduces accuracy. You can use an optional foot pod to record pace, distance, and cadence.

When cycling with GPS turned off, speed and distance are not available unless you have an optional sensor that sends speed and distance data to the device (such as a speed or cadence sensor).

Going for a Virtual Run

You can pair your Descent Mk2i device with a compatible thirdparty app to transmit pace, heart rate, or cadence data.

From the watch face, press START.

Select Virtual Run.

On your tablet, laptop, or smartphone, open the Zwift™ app or

another virtual training app. Follow the on-screen instructions to start a running activity

and pair the devices. Press START to start the activity timer.

After you complete your run, press STOP to stop the activity

timer.

Calibrating the Treadmill Distance

To record more accurate distances for your treadmill runs, you can calibrate the treadmill distance after you run at least 1.5 km (1 mi.) on a treadmill. If you use different treadmills, you can manually calibrate the treadmill distance on each treadmill or after each run.

Start a treadmill activity (Starting an Activity, page 12).

Run on the treadmill until your Descent Mk2i device records

at least 1.5 km (1 mi.). After you complete your run, press STOP.

Select an option:

• To calibrate the treadmill distance the first time, select Save.

The device prompts you to complete the treadmill calibration.

• To manually calibrate the treadmill distance after the firsttime calibration, select Calibrate & Save > Yes.

Check the treadmill display for the distance traveled, and

enter the distance on your device.

Recording a Strength Training Activity

You can record sets during a strength training activity. A set is multiple repetitions (reps) of a single move.

Activities and Apps 13

From the watch face, press START.

Select Strength.

Select a workout.

The first time you record a strength training activity, you must select which wrist your watch is on.

Select View to view a list of workout steps (optional).

TIP: While viewing workout steps, you can press START to

view an animation of the selected exercise, if available. Select Do Workout.

Press START to start the set timer.

Start your first set.

The device counts your reps. Your rep count appears when you complete at least four reps.

TIP: The device can only count reps of a single move for each set. When you want to change moves, you should finish the set and start a new one.

Press LAP to finish the set and move to the next exercise, if

available. The watch displays the total reps for the set. After several

seconds, the rest timer appears. If necessary, press DOWN, and edit the number of reps.

TIP: You can also add the weight used for the set. When you are done resting, press LAP to start your next set.

Repeat for each strength training set until your activity is

complete. After your last set, press START to stop the set timer.

Select Save.

Outdoor Activities

The Descent device comes preloaded with outdoor activities, such as running and cycling. GPS is turned on for outdoor activities. You can add new activities based on default activities, such as walking or rowing. You can also add custom activities to your device (Creating a Custom Activity, page 13).

Viewing Tide Information

WARNING

Tide information is for information purposes only. It is your responsibility to heed all posted water-related guidance, to remain aware of your surroundings, and to use safe judgment in, on, and around the water at all times. Failure to heed this warning could result in serious personal injury or death.

You can view information about a tide station, including the tide height and when the next high and low tides will occur.

From the watch face, press START.

Select Tides.

Select an option:

• To use your current location when you are near a tide

station, select Search > Current Location.

• To select a location on the map, select Search > Use Map.

• To enter the name of a city, select Search > City Search.

• To select a saved location, select Search > Saved Locations.

• To enter coordinates for a location, select Search > Coordinates.

A 24-hour tide chart appears for the current date with the current tide height and information about the next tide .

Press DOWN to see tide information for upcoming days.

Press START, and select Star Location to save the tide

station (optional).

Viewing Your Ski Runs

Your device records the details of each downhill skiing or snowboarding run using the auto run feature. This feature is turned on by default for downhill skiing and snowboarding. It automatically records new ski runs based on your movement. The timer pauses when you stop moving downhill and when you are on a chairlift. The timer remains paused during the chairlift ride. You can start moving downhill to restart the timer. You can view run details from the paused screen or while the timer is running.

Start a skiing or snowboarding activity.

Hold MENU.

Select View Runs.

Press UP and DOWN to view details of your last run, your

current run, and your total runs. The run screens include time, distance traveled, maximum

speed, average speed, and total descent.

Recording a Backcountry Skiing Activity

The backcountry skiing activity lets you manually switch between climbing and descending tracking modes so you can accurately track your statistics.

From the watch face, press START.

Select Backcountry Ski.

Select an option:

• If you are starting your activity on a climb, select

Climbing.

• If you are starting your activity moving downhill, select

Descending.

Press START to start the activity timer.

Press LAP to switch between climbing and descending

tracking modes. After your activity is finished, press START to stop the timer.

Select Save.

Using the Metronome

The metronome feature plays tones at a steady rhythm to help you improve your performance by training at a faster, slower, or more consistent cadence.

NOTE: This feature is not available for all activities.

From the watch face, press START.

Select an activity.

Hold MENU.

Select the activity settings.

Select Metronome > Status > On.

Select an option:

• Select Beats / Minute to enter a value based on the

cadence you want to maintain.

• Select Alert Frequency to customize the frequency of the

beats.

14 Activities and Apps

• Select Sounds to customize the metronome tone and vibration.

If necessary, select Preview to listen to the metronome

feature before you run. Go for a run (Starting an Activity, page 12).

The metronome starts automatically. During your run, press UP or DOWN to view the metronome

screen. If necessary, hold MENU to change the metronome settings.

Playing Audio Prompts During an Activity

You can enable your Descent Mk2i device to play motivational status announcements during a run or other activity. Audio prompts play on your connected headphones using Bluetooth technology, if available. Otherwise, audio prompts play on your smartphone paired through the Garmin Connect app. During an audio prompt, the device or smartphone mutes the primary audio to play the announcement.

NOTE: This feature is not available for all activities.

Hold MENU.

Select Audio Prompts.

Select an option:

• To hear a prompt for each lap, select Lap Alert. NOTE: The Lap Alert audio prompt is enabled by default.

• To customize prompts with your pace and speed information, select Pace/Speed Alert.

• To customize prompts with your heart rate information, select Heart Rate Alert.

• To customize prompts with power data, select Power Alert.

• To hear prompts when you start and stop the timer, including the Auto Pause® feature, select Timer Events.

• To hear activity alerts play as an audio prompt, select Activity Alerts.

• To change the language or the dialect of the voice prompts, select Dialect.

Jumpmaster

WARNING

The jumpmaster feature is for use by experienced skydivers only. The jumpmaster feature should not be used as a primary skydiving altimeter. Failure to input the appropriate jump related information can lead to serious personal injury or death.

The jumpmaster feature follows military guidelines for calculating the high altitude release point (HARP). The device detects automatically when you have jumped to begin navigating toward the desired impact point (DIP) using the barometer and electronic compass.

Multisport

Triathletes, duathletes, and other multisport competitors can take advantage of the multisport activities, such as Triathlon or Swimrun. During a multisport activity, you can transition between activities and continue to view your total time and distance. For example, you can switch from biking to running and view your total time and distance for biking and running throughout the multisport activity.

You can customize a multisport activity, or you can use the default triathlon activity set up for a standard triathlon.

Triathlon Training

When you participate in a triathlon, you can use the triathlon activity to quickly transition to each sport segment, to time each segment, and to save the activity.

From the watch face, press START.

Select Triathlon.

Press START to start the activity timer.

Press LAP at the beginning and end of each transition.

The transition feature can be turned on or off for the triathlon activity settings.

After you complete your activity, press STOP, and select

Save.

Creating a Multisport Activity

From the watch face, press START.

Select Add > Multisport.

Select a multisport activity type, or enter a custom name.

Duplicate activity names include a number. For example, Triathlon(2).

Select two or more activities.

Select an option:

• Select an option to customize specific activity settings. For example, you can select whether to include transitions.

• Select Done to save and use the multisport activity.

Select Yes to add the activity to your list of favorites.

Swimming

Swim Terminology

Length: One trip down the pool. Interval: One or more consecutive lengths. A new interval starts

after a rest.

Stroke: A stroke is counted every time your arm wearing the

device completes a full cycle.

Swolf: Your swolf score is the sum of the time for one pool

length and the number of strokes for that length. For example, 30 seconds plus 15 strokes equals a swolf score of

45. For open water swimming, swolf is calculated over 25

meters. Swolf is a measurement of swimming efficiency and, like golf, a lower score is better.

Critical swim speed (CSS): Your CSS is the theoretical speed

that you can maintain continuously without exhaustion. You can use your CSS to guide your training pace and monitor your improvement.

Stroke Types

Stroke type identification is available only for pool swimming. Your stroke type is identified at the end of a length. Stroke types appear in your swimming history and in your Garmin Connect account. You can also select stroke type as a custom data field (Customizing the Data Screens, page 41).

Free Freestyle

Back Backstroke

Breast Breaststroke

Fly Butterfly

Mixed More than one stroke type in an interval

Drill Used with drill logging (Training with the Drill Log, page 16)

Tips for Swimming Activities

• Before starting a pool swimming activity, follow the on-screen instructions to select your pool size or enter a custom size.

The next time you start a pool swimming activity, the device uses this pool size. You can hold MENU, select the activity settings, and select Pool Size to change the size.

• Press LAP to record a rest during pool swimming. The device automatically records swim intervals and lengths

for pool swimming.

• Press LAP to record an interval during open water swimming.

Activities and Apps 15

+ 49 hidden pages

Garmin Descent Mk2i Owner's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Introduction

Getting Started

Buttons

Using the Watch

Viewing the Controls Menu

Enabling Airplane Mode

Viewing Widgets

Customizing the Watch

Default Watch Face

Pairing Your Smartphone

Charging the Device

Product Updates

Setting Up Garmin Express

Diving

Dive Warnings

Dive Modes

Using the Pool Dive Mode

Dive Setup

Setting Up Your Breathing Gases

Setting PO2 Thresholds

Setting CCR Setpoints

Air Integration

Installation and Setup

Transmitter Position Tips

Installing the Transmitter on Your Tank Regulator

Installing the Transmitter on a High Pressure Hose Extension

Pairing the Transmitter with a Descent Mk2i Dive Computer

Selecting Paired Transmitters to View on Your Dive Data Screens

Transmitter Settings

Selecting the Gas Consumption Rate Metric

Including Transmitters in Gas Consumption Calculations

CCR Data Screens

Dive Data Screens

Single-Gas and Multi-Gas Data Screens

Gauge Data Screens

Apnea and Apnea Hunt Data Screens

Starting a Dive

Navigating with the Dive Compass

Using the Dive Stopwatch

Viewing the Transmitter Data Screens

Switching Between CC and OC Diving for a Bailout Procedure

Performing a Safety Stop

Switching Gases During a Dive

Performing a Decompression Stop

Diving with the Map

Viewing the Surface Interval Widget

Viewing the Dive Log Widget

Dive Planning

Calculating NDL Time

Creating a Decompression Plan

Viewing and Applying a Decompression Plan

Editing a Decompression Plan

Deleting a Decompression Plan

No-Fly Time

Altitude Diving

Tips for Wearing the Device with an Exposure Suit

Dive Alerts

Transmitter Alerts

Enabling Lost Transmitter Alerts

Dive Terminology

Activities and Apps

Starting an Activity

Tips for Recording Activities

Changing the Power Mode

Stopping an Activity

Adding or Removing a Favorite Activity

Creating a Custom Activity

Indoor Activities

Going for a Virtual Run

Calibrating the Treadmill Distance

Recording a Strength Training Activity

Outdoor Activities

Viewing Tide Information

Viewing Your Ski Runs

Recording a Backcountry Skiing Activity