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Dive Alerts
Alert Message Cause Device Action
None You completed the decompression stop.
The decompression stop depth and
time flash blue for five seconds.
None
Your partial pressure of oxygen (PO2)
value is above the specified warning
value.
Your PO2 value flashes yellow.
%1 OTU accumulated. End
your dive now.
Your oxygen toxicity units are above the
safe limit. During a dive, "%1" is replaced
with the number of units accumulated.
The alert appears every two minutes,
up to three times.
250 OTU accumulated.
Your oxygen toxicity units (OTU) are at
250 units, and you are nearing the safe
limit of 300 units.
None
Approaching Deco Stop
You are within one stop interval (3 m or
9.8 ft.) of the decompression stop depth.
None
Approaching NDL You are at 80% of your tissue load. None
Ascending too fast. Slow
your ascent.
You are ascending faster than 9.1 m/
min. (30 ft./min.) for more than 5
seconds.
None
Battery critically low. End
your dive now.
Less than 10% battery power remains.
The alert appears when the device is
below 10% battery power and on the
dive pre-check screen for your next
dive.
Battery is low. Less than 20% battery power remains.
The alert appears when the device is
below 20% battery power and on the
dive pre-check screen for your next
dive.
CNS toxicity at %1%. End
your dive now.
Your CNS oxygen toxicity is too high.
During a dive, "%1" is replaced with your
current CNS percentage.
The alert appears every two minutes,
up to three times.
CNS toxicity at 80%.
Your central nervous system (CNS)
oxygen toxicity is at 80% of the safe
limit.
The alert appears during a dive and on
the dive pre-check screen for your next
dive.
Decompression Cleared You completed all decompression stops. None
Descend below deco
ceiling.
You are more than 0.6 m (2 ft.) above the
decompression ceiling.
The current depth and stop depth flash
red.
If you remain above the decompres
sion ceiling for more than three
minutes, the decompression lockout
feature goes into effect.
Descend to complete
safety stop.
You are more than 2 m (8 ft.) above the
safety stop ceiling.
The current depth and stop depth flash
yellow.
Do not dive. Failed to read
depth sensor.
The device has invalid or missing depth
sensor data before you start a dive
activity.
Do not start a dive. Call Garmin
Product Support.
22 Diving
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