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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
1
Connect the device to your computer using a USB cable.
2
Go to www.garmin.com/express.
3
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.
1
Hold LIGHT to view the controls menu.
2
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
8


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