Setting CCR Setpoints
You can configure the high and low partial pressure of oxygen (PO2) setpoints for closed-circuit rebreather
(CCR) dives.
1 Hold MENU.
2 Select Dive Setup > CCR Setpoints.
3 Select an option:
• To configure the lower PO2 setpoint, select Low Setpoint.
• To configure the upper PO2 setpoint, select High Setpoint.
4 Select Mode.
5 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.
6 Select PO2, and enter a value.
7 If necessary, select Depth, and enter a depth value for the automatic setpoint change.
No-Fly Time
After a dive, you may need to wait several hours before it is safe to fly on an airplane. To indicate your remaining
no-fly time, appears on the default watch face, along with a no-fly time estimate in hours (Default Watch
Face, page85). You can view more details on the surface interval glance (Viewing the Surface Interval Glance,
page21).
TIP: You can add the no-fly indicator to a custom watch face (Customizing the Watch Face, page85).
Hold MENU, and select Dive Setup > Advanced Settings > No-Fly Time.
No-Fly Time Mode Dive Type No-Fly Time
Standard or 24 Hours Dive duration of 3 minutes or less or depth of 5 m (15 ft.) or less. 0 hours
Standard Non-decompression dive more than 48 hours since the previous dive. 12 hours
Standard Multiple non-decompression dives within 48 hours. 18 hours
Standard Dive with a completed decompression stop. 24 hours
24 Hours Non-gauge dive that did not violate the decompression plan. 24 hours
Standard or 24 Hours Gauge dive or a dive that violated the decompression plan. 48 hours
Air Integration
The Descent Mk3i watch can be used with a paired Descent transceiver to view tank pressure, depth, 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. For more information about the Descent transceiver, see the owner's
manual for your device.
8 Diving
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