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PO2: Sets your decompression partial pressure of oxygen (PO2)
threshold, in bar. You can adjust the PO2 warning and critical
alert thresholds.
Alerts: Allows you to set 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. If the Auto mode is
enabled, the device automatically switches to the high or low
setpoint based on your current depth. 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.
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.
Backlight: Allows you to adjust the backlight settings for dive
activities.
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 on your Garmin
Connect account after you complete the dive.
Double Tap to Scroll: Allows you to double tap the device to
scroll through the dive data screens.
Deco Lockout: Allows you to disable the decompression
lockout feature. This feature prevents single-gas and multi-
gas 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.
Starting a Dive
1
From the watch face, select .
2
Select a dive mode (Dive Modes, page 2).
3
If necessary, select DOWN to edit the dive settings, such as
the gases, water type, and alerts (Dive Setup, page 2).
4
Wait with your wrist out of the water until the device acquires
GPS signals and GPS turns green.
The device requires GPS signals to save your dive entry
location.
5
Select .
6
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.
7
Select DOWN to scroll through the data screens and dive
compass.
TIP: You can also double tap the device to scroll through the
screens.
When you return to the surface, 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.
Dive Data Screens
During a single-gas, multi-gas, or closed-circuit rebreather
(CCR) dive, you can view the current dive conditions, the dive
compass, and physiological data (Viewing the Primary Gas Dive
Data Screen, page 3, Navigating with the Dive Compass,
page 3, Viewing Additional Gas Dive Data, page 4).
During a gauge dive, you can view the current dive conditions,
the dive stopwatch, the dive compass, and heart rate data
(Using the Dive Stopwatch, page 4, Navigating with the Dive
Compass, page 3, Viewing Additional Gas Dive Data,
page 4).
During an apnea or apnea hunt dive, you can view the current
dive conditions, your surface time, details about your last dive,
heart rate data, and the map (Diving with the Map, page 4).
TIP: In the activity settings, you can reorder the default data
screens and add a dive stopwatch screen for gas dive activities
(Customizing the Data Screens, page 26). You cannot
customize the data fields for dive activities.
Viewing the Primary Gas Dive Data Screen
1
During a single-gas, multi-gas, or closed-circuit rebreather
(CCR) dive, scroll to the first data screen.
Your nitrogen (N2) 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.
Your partial pressure of oxygen (PO2) level.
During a CCR dive, indicates whether closed-circuit (CC) or
open-circuit (OC) diving is active.
2
When you pass the no-decompression limit (NDL) time or
perform a safety stop, the data screen shows ascent
information.
The safety or decompression stop ceiling depth.
The safety or decompression stop time remaining.
Navigating with the Dive Compass
1
During a single-gas, multi-gas, closed-circuit rebreather, or
gauge dive, scroll to the dive compass.
Diving 3
9


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