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Dive Terminology
Central nervous system (CNS): A measure of central nervous system oxygen toxicity caused by exposure to
increased partial pressure of oxygen (PO2) while diving.
Closed-circuit rebreather (CCR): A diving mode used for dives performed with a rebreather that recirculates
exhaled gas and removes carbon dioxide.
Maximum operating depth (MOD): The greatest depth at which a breathing gas can be used before the partial
pressure of oxygen (PO2) exceeds the safe limit.
No decompression limit (NDL): A dive that does not require decompression time while ascending to the
surface.
Oxygen toxicity units (OTU): A measure of pulmonary oxygen toxicity caused by exposure to increased partial
pressure of oxygen (PO2) while diving. One OTU is equivalent to breathing 100% oxygen at 1 ATM for 1
minute.
Partial pressure of oxygen (PO2): The pressure of the oxygen in the breathing gas, based on depth and oxygen
percentage.
Surface interval (SI): The amount of time that has elapsed since the completion of the last dive.
Time to surface (TTS): The estimated amount of time it will take to ascend to the surface, including
decompression stops.
Activities and Apps
Your watch can be used for indoor, outdoor, athletic, and fitness activities. When you start an activity, the watch
displays and records sensor data. You can create custom activities or new activities based on default activities
(Creating a Custom Activity, page 29). When you finish your activities, you can save and share them with the
Garmin Connect
™
community.
You can also add Connect IQ
™
activities and apps to your watch using the Connect IQ app (Connect IQ Features,
page 48).
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).
1 From the watch face, press START.
2 Select an option:
• Select an activity from your favorites.
• Select , and select an activity from the extended activity list.
3 If the activity requires GPS signals, go outside to an area with a clear view of the sky, and wait until the watch
is ready.
The watch is ready after it establishes your heart rate, acquires GPS signals (if required), and connects to
your wireless sensors (if required).
4 Press START to start the activity timer.
The watch records activity data only while the activity timer is running.
Tips for Recording Activities
• Charge the device before starting an activity (Charging the Watch, page 5).
• Press LAP to record laps, start a new set or pose, or advance to the next workout step.
• Press UP or DOWN to view additional data pages.
26 Activities and Apps
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