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DESCENT

™

MK1

Owner’s Manual

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+

, Auto Lap

, Auto Pause

, Edge

, inReach

, TracBack

, VIRB

, and Virtual Partner

are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and

other countries. Connect IQ

™

, Descent

™

, Garmin Connect

™

, Garmin Express

™

, Garmin Golf

™

, Garmin Move IQ

™

, HRM-Run

™

, HRM-Tri

™

, QuickFit

™

, 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.

American Heart Association

is a registered trademark of American Heart Association, Inc. Android

™

is a trademark of Google Inc. Apple

and Mac

are trademarks of Apple Inc., registered in the

U.S. and other countries. The Bluetooth

word mark and logos are owned by the Bluetooth SIG, Inc. and any use of such marks by Garmin is under license. The Cooper Institute

, as well as any

related trademarks, are the property of The Cooper Institute. Di2

™

is a trademark of Shimano, Inc. Shimano

is a registered trademark of Shimano, Inc. STRAVA and Strava

™

are trademarks of

Strava, Inc. Advanced heartbeat analytics by Firstbeat. Training Stress Score

™

(TSS), Intensity Factor

™

(IF), and Normalized Power

™

(NP) are trademarks of Peaksware, LLC. Wi‑Fi

is a

registered mark of Wi-Fi Alliance Corporation. Windows

is a registered trademark of Microsoft Corporation in the United States and other countries. Other trademarks and trade names are those

of their respective owners.

This product is ANT+

certified. Visit www.thisisant.com/directory for a list of compatible products and apps.

Table of Contents

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

Device Overview......................................................................... 1

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

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

Charging the Device................................................................... 1

Pairing Your Smartphone with Your Device............................... 1

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

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

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

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

Dive Modes................................................................................. 2

Using the Pool Dive Mode..................................................... 2

Dive Setup.................................................................................. 2

Starting a Dive............................................................................ 3

Dive Data Screens...................................................................... 3

Viewing the Primary Gas Dive Data Screen.......................... 3

Navigating with the Dive Compass........................................ 3

Viewing Additional Gas Dive Data......................................... 4

Using the Dive Stopwatch...................................................... 4

Diving with the Map................................................................4

Viewing the Surface Interval Widget........................................... 4

Viewing the Dive Log Widget...................................................... 4

Dive Planning..............................................................................4

Calculating NDL Time............................................................ 4

Creating a Decompression Plan............................................ 5

Viewing and Applying a Decompression Plan....................... 5

Editing a Decompression Plan............................................... 5

Deleting a Decompression Plan.............................................5

No-Fly Time................................................................................ 5

Tips for Wearing the Device with an Exposure Suit................... 5

Dive Alerts.................................................................................. 5

Activities and Apps........................................................ 6

Starting an Activity...................................................................... 6

Tips for Recording Activities.................................................. 6

Stopping an Activity.................................................................... 6

Adding or Removing a Favorite Activity...................................... 6

Creating a Custom Activity......................................................... 6

Indoor Activities.......................................................................... 6

Calibrating the Treadmill Distance......................................... 7

Recording a Strength Training Activity...................................7

Outdoor Activities........................................................................7

Viewing Your Ski Runs.......................................................... 7

Using the Metronome.............................................................7

Jumpmaster........................................................................... 7

Multisport.................................................................................... 7

Creating a Multisport Activity................................................. 7

Tips for Triathlon Training or Using Multisport Activities........ 8

Swimming................................................................................... 8

Swim Terminology................................................................. 8

Stroke Types.......................................................................... 8

Tips for Swimming Activities.................................................. 8

Resting During Pool Swimming............................................. 8

Training with the Drill Log...................................................... 8

Golfing........................................................................................ 8

Playing Golf............................................................................8

Hole Information.....................................................................8

Moving the Flag..................................................................... 9

Viewing Hazards.................................................................... 9

Viewing Measured Shots....................................................... 9

Viewing Layup and Dogleg Distances................................... 9

Keeping Score....................................................................... 9

Updating a Score................................................................... 9

TruSwing™............................................................................ 9

Using the Golf Odometer

....................................................... 9

Tracking Statistics.................................................................. 9

Connected Features....................................................... 9

Enabling Bluetooth Notifications................................................. 9

Viewing Notifications............................................................ 10

Receiving an Incoming Phone Call...................................... 10

Replying to a Text Message................................................ 10

Managing Notifications.........................................................10

Turning Off the Bluetooth Smartphone Connection.................. 10

Turning On and Off Smartphone Connection Alerts................. 10

Locating a Lost Mobile Device.................................................. 10

Garmin Connect........................................................................10

Updating the Software Using Garmin Connect Mobile........ 11

Updating the Software Using Garmin Express.................... 11

Using Garmin Connect on Your Computer..................... 11

Manually Syncing Data with Garmin Connect Mobile.......... 11

Garmin Golf™ App...............................................................11

Starting a GroupTrack Session.................................................11

Tips for GroupTrack Sessions............................................. 11

Wi‑Fi® Connected Features........................................ 11

Connecting to a Wi‑Fi Network................................................. 11

Connect IQ Features.................................................... 12

Downloading Connect IQ Features Using Your Computer....... 12

Heart Rate Features..................................................... 12

Wrist-based Heart Rate............................................................ 12

Wearing the Device..............................................................12

Tips for Erratic Heart Rate Data...........................................12

Viewing the Heart Rate Widget............................................ 12

Broadcasting Heart Rate Data to Garmin Devices.............. 12

Broadcasting Heart Rate Data During an Activity........... 12

Setting an Abnormal Heart Rate Alert................................. 13

Turning Off the Wrist-based Heart Rate Monitor................. 13

Putting On the Heart Rate Monitor........................................... 13

Tips for Erratic Heart Rate Data...........................................13

Caring for the Heart Rate Monitor........................................ 13

Running Dynamics....................................................................13

Training with Running Dynamics......................................... 13

Color Gauges and Running Dynamics Data........................ 14

Ground Contact Time Balance Data............................... 14

Vertical Oscillation and Vertical Ratio Data.....................14

Tips for Missing Running Dynamics Data............................ 14

Performance Measurements.................................................... 14

Turning Off Performance Notifications................................. 15

Detecting Performance Measurements Automatically......... 15

Syncing Activities and Performance Measurements........... 15

Training Status..................................................................... 15

Tips for Getting Your Training Status.............................. 15

About VO2 Max. Estimates.................................................. 16

Getting Your VO2 Max. Estimate for Running................ 16

Getting Your VO2 Max. Estimate for Cycling.................. 16

Recovery Time..................................................................... 16

Viewing Your Recovery Time.......................................... 16

Recovery Heart Rate........................................................... 16

Training Load....................................................................... 16

Viewing Your Predicted Race Times................................... 17

About Training Effect........................................................... 17

Heart Rate Variability and Stress Level............................... 17

Viewing Your Heart Rate Variability and Stress Level.... 17

Performance Condition........................................................ 17

Viewing Your Performance Condition............................. 17

Lactate Threshold................................................................ 17

Performing a Guided Test to Determine Your Lactate

Threshold........................................................................ 18

Getting Your FTP Estimate.................................................. 18

Conducting an FTP Test................................................. 18

Table of Contents i

Training......................................................................... 18

Setting Up Your User Profile.....................................................18

Fitness Goals....................................................................... 18

About Heart Rate Zones...................................................... 18

Setting Your Heart Rate Zones....................................... 18

Letting the Device Set Your Heart Rate Zones............... 19

Heart Rate Zone Calculations......................................... 19

Setting Your Power Zones................................................... 19

Activity Tracking........................................................................19

Auto Goal............................................................................. 19

Using the Move Alert............................................................19

Sleep Tracking..................................................................... 20

Using Automated Sleep Tracking....................................20

Using Do Not Disturb Mode............................................ 20

Intensity Minutes.................................................................. 20

Earning Intensity Minutes................................................ 20

Garmin Move IQ™............................................................... 20

Activity Tracking Settings..................................................... 20

Turning Off Activity Tracking........................................... 20

Workouts...................................................................................20

Following a Workout From the Web.....................................20

Starting a Workout............................................................... 20

About the Training Calendar................................................ 20

Using Garmin Connect Training Plans............................ 21

Adaptive Training Plans.................................................. 21

Interval Workouts...................................................................... 21

Creating an Interval Workout............................................... 21

Starting an Interval Workout................................................ 21

Stopping an Interval Workout...............................................21

Segments..................................................................................21

Strava™ Segments.............................................................. 21

Viewing Segment Details..................................................... 21

Racing a Segment............................................................... 21

Using Virtual Partner®.............................................................. 21

Setting a Training Target.......................................................... 22

Cancelling a Training Target................................................ 22

Racing a Previous Activity........................................................ 22

Personal Records..................................................................... 22

Viewing Your Personal Records.......................................... 22

Restoring a Personal Record............................................... 22

Clearing a Personal Record................................................. 22

Clearing All Personal Records............................................. 22

Clock.............................................................................. 22

Setting an Alarm....................................................................... 22

Deleting an Alarm................................................................ 22

Starting the Countdown Timer.................................................. 22

Using the Stopwatch................................................................. 23

Setting Clock Alerts.................................................................. 23

Syncing the Time with GPS...................................................... 23

Navigation..................................................................... 23

Saving Your Location............................................................... 23

Editing Your Saved Locations.............................................. 23

Projecting a Waypoint............................................................... 23

Navigating to a Destination....................................................... 23

Navigating to a Point of Interest............................................... 23

Points of Interest.................................................................. 23

Creating and Following a Course on Your Device.................... 23

Creating a Round-Trip Course..................................................24

Marking and Starting Navigation to a Man Overboard

Location.................................................................................... 24

Navigating with Sight 'N Go...................................................... 24

Navigating to Your Starting Point During an Activity................ 24

Navigating to the Starting Point of Your Last Saved Activity.... 24

Stopping Navigation................................................................. 24

Map........................................................................................... 24

Viewing the Map.................................................................. 24

Saving or Navigating to a Location on the Map

................... 24

Navigating with the Around Me Feature.............................. 25

Compass...................................................................................25

Altimeter and Barometer........................................................... 25

History........................................................................... 25

Using History............................................................................ 25

Multisport History................................................................. 25

Viewing Your Time in Each Heart Rate Zone...................... 25

Viewing Data Totals.................................................................. 25

Using the Odometer..................................................................25

Deleting History........................................................................ 25

Customizing Your Device............................................ 26

Activities and App Settings....................................................... 26

Customizing the Data Screens............................................ 26

Adding a Map to an Activity................................................. 26

Alerts.................................................................................... 26

Setting an Alert................................................................27

Activity Map Settings............................................................27

Routing Settings...................................................................27

Auto Lap...............................................................................27

Marking Laps by Distance............................................... 27

Enabling Auto Pause®......................................................... 28

Enabling Auto Climb............................................................ 28

3D Speed and Distance....................................................... 28

Turning On and Off the Lap Key.......................................... 28

Using Auto Scroll................................................................. 28

UltraTrac.............................................................................. 28

Power Save Timeout Settings..............................................28

Changing the Order of an Activity in the Apps List................... 28

Widgets..................................................................................... 28

Customizing the Widget Loop.............................................. 29

inReach Remote.................................................................. 29

Using the inReach Remote............................................. 29

VIRB Remote....................................................................... 29

Controlling a VIRB Action Camera.................................. 29

Controlling a VIRB Action Camera During an Activity..... 29

Using the Stress Level Widget............................................. 29

Customizing the Controls Menu................................................30

Watch Face Settings.................................................................30

Customizing the Watch Face............................................... 30

Sensors Settings.......................................................................30

Compass Settings................................................................ 30

Calibrating the Compass Manually................................. 30

Setting the North Reference............................................30

Altimeter Settings................................................................. 30

Calibrating the Barometric Altimeter............................... 30

Barometer Settings.............................................................. 31

Calibrating the Barometer............................................... 31

Map Settings............................................................................. 31

Marine Map Settings............................................................ 31

Showing and Hiding Map Data............................................ 31

GroupTrack Settings................................................................. 31

Navigation Settings................................................................... 31

Customizing Map Features.................................................. 31

Setting Up a Heading Bug................................................... 31

Setting Navigation Alerts......................................................31

System Settings........................................................................ 31

Time Settings....................................................................... 32

Changing the Backlight Settings.......................................... 32

Customizing the Hot Keys....................................................32

Changing the Units of Measure........................................... 32

Viewing Device Information...................................................... 32

Viewing E-label Regulatory and Compliance Information.... 32

Wireless Sensors......................................................... 32

Pairing Your Wireless Sensors................................................. 32

ii Table of Contents

Extended Display Mode............................................................ 33

Using an Optional Bike Speed or Cadence Sensor.................. 33

Training with Power Meters...................................................... 33

Using Electronic Shifters...........................................................33

Situational Awareness.............................................................. 33

Foot Pod................................................................................... 33

Improving Foot Pod Calibration........................................... 33

Calibrating Your Foot Pod Manually.................................... 33

Setting Foot Pod Speed and Distance................................. 33

tempe™.................................................................................... 33

Device Information....................................................... 33

Descent Mk1 Specifications......................................................33

Battery Information...............................................................34

Data Management.................................................................... 34

Disconnecting the USB Cable..............................................34

Deleting Files....................................................................... 34

Device Maintenance..................................................... 34

Device Care.............................................................................. 34

Cleaning the Device............................................................. 34

Changing the QuickFit™ Bands............................................... 34

Extra Long Diving Band............................................................ 34

Metal Watch Band Adjustment................................................. 34

Troubleshooting........................................................... 34

My device is in the wrong language......................................... 34

Is my smartphone compatible with my device?........................ 34

My phone will not connect to the device................................... 35

Can I use my Bluetooth sensor with my watch?....................... 35

Restarting Your Device............................................................. 35

Restoring All Default Settings................................................... 35

Resetting Your Tissue Load..................................................... 35

Acquiring Satellite Signals........................................................ 35

Improving GPS Satellite Reception......................................35

The temperature reading is not accurate.................................. 35

Maximizing the Battery Life.......................................................35

Activity Tracking........................................................................35

My daily step count does not appear................................... 35

My step count does not seem accurate............................... 36

The step counts on my device and my Garmin Connect

account don't match............................................................. 36

The floors climbed amount does not seem accurate........... 36

My intensity minutes are flashing......................................... 36

Getting More Information.......................................................... 36

Appendix....................................................................... 36

Data Fields................................................................................36

VO2 Max. Standard Ratings..................................................... 39

FTP Ratings.............................................................................. 40

Wheel Size and Circumference................................................ 40

Symbol Definitions.................................................................... 40

Index.............................................................................. 42

Table of Contents iii

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.

Device Overview

LIGHT

Select to turn the backlight on and off.

Hold to view the controls menu.

Hold to turn the device on.

NOTE: While diving, hold functions are disabled.

Select to view the activity list and start or stop an activity.

Select to choose an option in a menu.

Select for the dive compass, stopwatch, or gas switching

during a dive.

BACK

Select to return to the previous screen.

Select to record a lap, rest, or transition during a multisport

activity.

NOTE: While diving, key presses are enabled only in menus.

DOWN

Select to scroll through the widget loop and menus.

Select to scroll through the data screens during a dive.

Hold to view the watch face from any screen.

Select to scroll through the widget loop and menus.

Hold to view the menu.

NOTE: While diving, key presses are disabled.

Double tap the device to scroll through the data screens during

a dive.

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.

NOTE: You can add, reorder, and remove the options in the

controls menu (Customizing the Controls Menu, page 30).

From any screen, hold LIGHT.

Select UP or DOWN to scroll through the options.

Viewing Widgets

Your device comes preloaded with several widgets, and more

are available when you pair your device with a smartphone.

• Select UP or DOWN.

The device scrolls through the widget loop.

• Select 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, select BACK to return to the

activity data pages.

Charging the Device

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 in the appendix.

The device is powered by a built-in lithium-ion battery that you

can charge using a standard wall outlet or a USB port on your

computer.

Plug the USB end of the cable into an AC adapter or a

computer USB port.

If necessary, plug the AC adapter into a standard wall outlet.

Pinch the sides of the charging cradle to open the arms on

the cradle.

With the contacts aligned, place the device into the cradle

and release the arms to hold the device in place.

When you connect the device to a power source, the device

turns on, and the battery charge level appears on the screen.

Charge the device completely.

Pairing Your Smartphone with Your Device

To use the connected features of the Descent device, it must be

paired directly through the Garmin Connect

™

Mobile app,

instead of from the Bluetooth

settings on your smartphone.

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

Garmin Connect Mobile app.

Bring your smartphone within 10 m (33 ft.) of your device.

Select LIGHT to turn on the device.

The first time you turn on the device, it is in pairing mode.

TIP: You can hold LIGHT and select to manually enter

pairing mode.

Select an option to add your device to your Garmin Connect

account:

• If this is the first time you are pairing a device with the

Garmin Connect Mobile app, follow the on-screen

instructions.

• If you already paired another device with the Garmin

Connect Mobile app, from the or menu, select

Garmin Devices > Add Device, and follow the on-screen

instructions.

Introduction 1

Product Updates

On your computer, install Garmin Express

™

(www.garmin.com

/express). On your smartphone, install the Garmin Connect

Mobile app.

This provides easy access to these services for Garmin

devices:

• Software updates

• Data uploads to Garmin Connect

• 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.

• 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,

and tank pressure.

• 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

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.

• 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 Mk1 device supports six dive modes. Each dive

mode has four phases: dive pre-check, surface display, in-dive,

and post-dive.

Single-Gas: Allows you to dive with a single gas blend.

Multi-Gas: Allows you to configure multiple gas blends and

switch gases during your dive. This mode supports one

bottom gas, and up to five additional gases for

decompression or backup.

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: Allows you to configure two PO2 setpoints, closed-circuit

(CC) gases, and open-circuit (OC) backup gases.

Gauge: 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: Allows you to free dive with apnea-specific dive data.

This mode has a higher data refresh rate.

Apnea Hunt: Similar to the Apnea dive mode, but tuned

specifically for spearfishers. Start and stop tones are

disabled.

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. You can enter the oxygen and

helium content for the gas, and the device calculates the

remaining percentage as the nitrogen content. You can have

up to twelve gases for each gas dive mode. The Mode option

allows you to set the intended use for the gas, such as

decompression or backup.

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.

Water Type: Allows you to select the water type.

2 Diving

The compass indicates your directional heading .

Select to set the heading.

The compass indicates deviations from the set heading .

Select , 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.

Viewing Additional Gas Dive Data

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

gauge dive, scroll to the third data screen.

Your current heart rate zone (About Heart Rate Zones,

page 18).

NOTE: You can view only wrist heart rate monitor data during a

dive.

Gray: Zone 1.

Blue: Zone 2.

Green: Zone 3.

Orange: Zone 4.

Red: Zone 5.

Your central nervous system (CNS) oxygen toxicity level during

a single-gas, multi-gas, or closed-circuit rebreather dive.

Green: 0 to 79% CNS oxygen toxicity.

Yellow: 80 to 99% CNS oxygen toxicity.

Red: 100% or greater CNS oxygen toxicity.

Using the Dive Stopwatch

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

gas dive modes (Customizing the Data Screens, page 26).

Start a Gauge dive.

Scroll to the stopwatch screen.

Select > Reset Avg. Depth to set the average depth to

your current depth.

Select > Start Stopwatch.

Select an option:

• To stop using the stopwatch, select > Stop Stopwatch.

• To restart the stopwatch, select > Reset Stopwatch.

Diving with the Map

You can view the map during apnea surface intervals.

During an apnea dive activity, scroll to the map.

Select , and select an option:

• To pan or zoom the map, select Pan/Zoom.

TIP: You can select to toggle between panning up and

down, panning left and right, or zooming. You can hold

to select the point indicated by the crosshairs.

• To mark your location, select Save Location.

TIP: You can select 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, select UP.

Select to view tissue details and oxygen toxicity units

(OTU).

NOTE: The OTU accumulated during a dive expire after 24

hours.

Viewing the Dive Log Widget

The widget displays a brief summary of your last recorded dive.

From the surface interval widget, select UP.

Select to view more information about a dive.

Select a dive.

Select an option:

• To view additional information about the activity, select

Details.

• 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 view the depth profile of the activity, select Depth

Profile.

• To view the temperature profile of the activity, select

Temperature Profile.

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.

Select > Plan Dive > Compute NDL.

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.

4 Diving

Select 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.

Select > Plan Dive > Deco Plans > Add New.

Enter a name for the decompression plan.

Select an option:

• Select PO2 to enter the maximum partial pressure of

oxygen, in bar.

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

• Select Conservatism to enter your level of conservatism

for decompression calculations.

• Select Gases to enter your gas blends.

• Select Bottom Depth to enter the maximum dive depth.

• Select Bottom Time to enter the time at the bottom depth.

Select Save.

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.

Select > Plan Dive > Deco Plans.

Select a decompression plan.

If necessary, select View to view the decompression plan,

then select BACK.

Select Apply to use the decompression plan settings for the

single-gas or multi-gas dive mode.

Editing a Decompression Plan

Select > Plan Dive > Deco Plans.

Select a decompression plan.

Select an option:

• Select Edit to change the decompression plan details.

• Select Rename to edit the name of the decompression

plan.

Edit the information.

Deleting a Decompression Plan

Select > Plan Dive > Deco Plans.

Select a decompression plan.

Select Delete > .

No-Fly Time

After a dive, appears on the default watch face, along with a

no-fly time estimate in hours. You should not fly in an airplane

during this time. 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 30).

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 the

exposure suit and other wrist-worn devices do not interfere

with the wrist-based heart rate monitor (Wearing the Device,

page 12).

Dive Alerts

Alert Message Cause Device Action

None Your partial

pressure of oxygen

(PO2) value is

above the specified

warning value.

Your PO2 value flashes

yellow.

PO2 is high.

Ascend or switch

to lower O2 gas.

Your PO2 value is

above the specified

critical value.

Your PO2 value flashes red.

The alert appears every 30

seconds until you ascend to a

safe level or switch gases.

PO2 is low.

Descend or switch

to higher O2 gas.

Your PO2 value is

below 0.18 bar.

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 until you descend to

a safe level or switch gases.

Approaching Deco

Stop

You are within one

stop interval (3 m

or 9.8 ft.) of the

decompression

stop depth.

None

Descend below

deco ceiling.

You are more than

0.6 m (2 ft.) above

the decompression

ceiling.

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.

None You completed the

decompression

stop.

The decompression stop

depth and time flash blue for

five seconds.

Decompression

cleared

You completed all

decompression

stops.

None

Safety Stop

Cleared

You completed the

safety stop.

None

Ascending too fast.

Slow your ascent.

You are ascending

faster than 10.1 m/

min. (33 ft./min.) for

more than 5

seconds.

None

CNS toxicity at

80%.

Your central

nervous system

(CNS) oxygen

toxicity is at 80% of

the safe limit.

The alert appears during a

dive and on the dive pre-

check screen for your next

dive.

CNS toxicity at

%1%. End your

dive now.

Your CNS oxygen

toxicity is too high.

During a dive, "%1"

is replaced with

your current CNS

percentage.

The alert appears every two

minutes until you end the

dive.

Diving 5

Alert Message Cause Device Action

250 OTU

accumulated.

Your oxygen

toxicity units (OTU)

are at 80% of the

safe limit (250

units).

None

%1 OTU

accumulated. End

your dive now.

Your oxygen

toxicity units are

above the safe

limit. During a dive,

"%1" is replaced

with the number of

units accumulated.

The alert appears every two

minutes until you end the

dive.

NDL exceeded.

Decompression

now required.

You have

exceeded your no

decompression

limit (NDL) time.

None

Approaching NDL You are at 80% of

your tissue load.

None

Battery is low. Less than 20%

battery power

remains.

The alert appears when the

device is below 20% battery

power and on the dive pre-

check screen.

Battery critically

low. End your dive

now.

Less than 10%

battery power

remains.

The alert appears when the

device is below 10% battery

power and on the dive pre-

check screen.

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 website (Connect IQ Features,

page 12).

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). When you stop the activity, the device returns to

watch mode.

From the watch face, select .

Select an activity.

If necessary, follow the on-screen instructions to enter

additional information.

If necessary, wait while the device connects to your ANT+

sensors.

If the activity requires GPS, go outside, and wait while the

device locates satellites.

Select to start the timer.

NOTE: The device does not record your activity data until

you start the timer.

Tips for Recording Activities

• Charge the device before starting an activity (Charging the

Device, page 1).

• Select BACK to record laps.

• Select UP or DOWN to view additional data pages.

Stopping an Activity

Select .

Select an option:

• To resume your activity, select Resume.

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

Save.

• 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

from the watch face, and it provides quick access to the

activities you use most. The first time you press to start an

activity, the device prompts you to select your favorite activities.

You can add or remove favorite activities at any time.

Hold MENU.

Select Settings > Activities & Apps.

Your favorite activities appear at the top of the list with a

white background. Other activities appear with a black

background.

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, 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 select an accent color or customize the

data screens.

• 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.

6 Activities and Apps

Garmin Descent Mk1 Handleiding

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