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 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.

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.

Failed to read depth sensor. End your dive now.

The device 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 no decompression limit (NDL) time.

None

PO2 is high. Ascend or switch to lower O2 gas.

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 or switch gases.

PO2 is low. Descend or switch to higher O2 gas.

Your PO2 value is below 0.18 bar.

If you are within the first two minutes of your dive, your PO2 value flashes yellow. Otherwise, your PO2 value flashes red.

The alert appears every 30 seconds, up to three times, until you descend to a safe level or switch gases.

Safe to switch to %1. Switch now?

In a multi-gas dive, a gas with a higher oxygen content is now safe to breathe. During a dive, "%1" is replaced with the name of the gas.

You can switch gases now, or wait to switch gases later in the dive.

Safety Stop Cleared

You completed the safety stop.

None

This pool dive will not be saved to the dive log.

The device is in pool dive mode.

The device will not save the current dive to the dive log.

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