Setting Up Your Breathing Gases; Custom Dive Alerts - Garmin DESCENT MK3 Series Owner's Manual

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.
1 Hold MENU.
2 Select Dive Setup > Gases.
3 Select a dive mode.
4 Select the first gas in the list.
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.
5 Select Oxygen, and enter the oxygen percentage of the gas blend.
6 Select Helium, and enter the helium percentage of the gas blend.
The device calculates the remaining percentage as the nitrogen content.
7 Press BACK.
8 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.

Custom Dive Alerts

You can set custom dive alerts to help you train toward a specific goal or to increase your awareness of your
environment.
Alert Name Dive Mode
Single-gas, multi-gas, CCR,
Depth
gauge, apnea, or apnea hunt.
High Speed Apnea or apnea hunt.
Low Speed Apnea or apnea hunt.
Neutral Buoyancy Apnea or apnea hunt.
Surface Timer Apnea or apnea hunt.
Target Depth Apnea or apnea hunt.
Single-gas, multi-gas, CCR,
Time
gauge, apnea, or apnea hunt.
Variometer Apnea or apnea hunt.
Start Apnea or apnea hunt.
Stop Apnea or apnea hunt.
6
Description
The alert occurs when you reach the selected depth.
The alert occurs when your vertical speed exceeds the
selected speed.
The alert occurs when your vertical speed drops below
the selected speed.
The alert occurs when you reach the selected depth.
The alert occurs when the selected time interval elapses.
The alert occurs when you reach the selected depth.
The alert occurs when the selected time interval elapses.
The alert occurs every time you reach the selected depth
interval.
The alert occurs when you start a dive.
The alert occurs when you stop a dive.
Diving