FĒNIX 8 SERIES Owner’s Manual

Custom Dive Alerts

You can set custom dive alerts to help you train toward a specific goal or to increase your awareness of yourenvironment.

Alert Name	Dive Mode	Description
Depth	Scuba dive or apnea dive	The alert occurs when you reach the selected depth.
Neutral Buoyancy	Apnea dive	The alert occurs when you reach the selected depth.
Start/Stop	Apnea dive	The alert occurs when you start or stop a dive.
Surface Timer	Apnea dive	The alert occurs when the selected time interval elapses.
Target Depth	Apnea dive	The alert occurs when you reach the selected depth.
Time	Scuba dive or apnea dive	The alert occurs when the selected time interval elapses.
Variometer	Apnea dive	The alert occurs every time you reach the selected depth interval.

Dive Alerts

Alert Message	Cause	Watch 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 have 10 minutes of no decompression limit (NDL) time remaining.	The alert appears again when you have 5 minutes of NDL time remaining.
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 watch 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 watch 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.
Deco/NDL guidance unavailable.	You have exceeded the depth limit for the watch.	Information that requires accurate tissue loading is unavailable for the remainder of the dive, including NDL time, stop times, and time to surface (TTS). The NDL field is replaced with a warning message.
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 decompression 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.
Dive will end in %1 seconds.	The watch will automatically end and save the dive. During a dive, “%1” is replaced by the number of seconds.	None
Do not dive. Failed to read depth sensor.	The watch has invalid or missing depth sensor data before you start a dive activity.	Do not start a dive. Call Garmin Product Support.
Failed to read depth sensor. End your dive now.	The watch has invalid or missing depth sensor data after you have started a dive activity.	Use a backup dive computer or dive plan and end your dive. Call Garmin Product Support.
NDL exceeded. Decompression now required.	You have exceeded your NDL time.	The watch begins providing decompression stop guidance.
PO2 is high.	Your PO2 value is above the specified critical value.	Your PO2 value flashes red. The alert appears every 30 seconds, up to three times, until you ascend to a safe level.
Safety Stop Cleared	You completed the safety stop.	None
Safety Stop Started	You ascended above 6 m (20 ft.) without other decompression guidance.	The safety stop countdown timer begins, if configured.
Watch rebooted. Evaluate dive conditions.	The watch rebooted during the dive.	The watch simulates the dive for the time it was rebooting. Since other alerts may not have been triggered, evaluate your current depth and dive conditions.

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Custom Dive Alerts

You can set custom dive alerts to help you train toward a specific goal or to increase your awareness of yourenvironment.

Alert Name	Dive Mode	Description
Depth	Scuba dive or apnea dive	The alert occurs when you reach the selected depth.
Neutral Buoyancy	Apnea dive	The alert occurs when you reach the selected depth.
Start/Stop	Apnea dive	The alert occurs when you start or stop a dive.
Surface Timer	Apnea dive	The alert occurs when the selected time interval elapses.
Target Depth	Apnea dive	The alert occurs when you reach the selected depth.
Time	Scuba dive or apnea dive	The alert occurs when the selected time interval elapses.
Variometer	Apnea dive	The alert occurs every time you reach the selected depth interval.

Dive Alerts

Alert Message	Cause	Watch 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 have 10 minutes of no decompression limit (NDL) time remaining.	The alert appears again when you have 5 minutes of NDL time remaining.
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 watch 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 watch 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.
Deco/NDL guidance unavailable.	You have exceeded the depth limit for the watch.	Information that requires accurate tissue loading is unavailable for the remainder of the dive, including NDL time, stop times, and time to surface (TTS). The NDL field is replaced with a warning message.
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 decompression 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.
Dive will end in %1 seconds.	The watch will automatically end and save the dive. During a dive, “%1” is replaced by the number of seconds.	None
Do not dive. Failed to read depth sensor.	The watch has invalid or missing depth sensor data before you start a dive activity.	Do not start a dive. Call Garmin Product Support.
Failed to read depth sensor. End your dive now.	The watch has invalid or missing depth sensor data after you have started a dive activity.	Use a backup dive computer or dive plan and end your dive. Call Garmin Product Support.
NDL exceeded. Decompression now required.	You have exceeded your NDL time.	The watch begins providing decompression stop guidance.
PO2 is high.	Your PO2 value is above the specified critical value.	Your PO2 value flashes red. The alert appears every 30 seconds, up to three times, until you ascend to a safe level.
Safety Stop Cleared	You completed the safety stop.	None
Safety Stop Started	You ascended above 6 m (20 ft.) without other decompression guidance.	The safety stop countdown timer begins, if configured.
Watch rebooted. Evaluate dive conditions.	The watch rebooted during the dive.	The watch simulates the dive for the time it was rebooting. Since other alerts may not have been triggered, evaluate your current depth and dive conditions.