Diving

Dive Warnings

WARNING

• The diving features of this device are for use by certified divers only. This device should not be used as a sole dive computer. Failure to input the appropriate dive-related information into the device can lead to serious personal injury or death.
• Do not exceed the maximum dive depth rating for the device (Specifications).
• Make sure that you fully understand the use, displays, and limitations of your device. If you have questions about this manual or the device, always resolve any discrepancies or confusion before diving with the device. Always remember that you are responsible for your own safety.
• There is always a risk of decompression illness (DCI) for any dive profile even if you follow the dive plan provided by the dive tables or a diving device. No procedure, diving device, or dive table will eliminate the possibility of DCI or oxygen toxicity. An individual’s physiological make up can vary from day to day. This device cannot account for these variations. You are strongly advised to remain well within the limits provided by this device to minimize the risk of DCI. You should consult a physician regarding your fitness before diving.
• Always use backup instruments, including a depth gauge, submersible pressure gauge, and timer or watch. You should have access to decompression tables when diving with this device.
• Perform pre-dive safety checks, such as checking proper device function and settings, display function, battery level, tank pressure, and bubble checks to check hoses and connections for leaks.
• This device should not be shared between multiple users for diving purposes. Diver profiles are user specific, and using another diver’s profile can result in misleading information that could lead to injury or death.
• For safety reasons, you should never dive alone. Dive with a designated buddy. You should also stay with others for an extended time after a dive, because the potential onset of decompression illness (DCI) may be delayed or triggered by surface activities.
• This device is not intended for commercial or professional dive activities. It is for recreational purposes only. Commercial or professional dive activities can expose the user to extreme depths or conditions that increase the risk of DCI.
• Do not dive with a gas if you have not personally verified its contents and input the analyzed value to the device. Failure to verify tank contents and input the appropriate gas values to the device will result in incorrect dive planning information and could result in serious injury or death.
• Diving with more than one gas mixture presents a much greater risk than diving with a single gas mixture. Mistakes related to the use of multiple gas mixtures may lead to serious injury or death.
• Always ensure a safe ascent. A rapid ascent increases the risk of DCI.
• Disabling the deco lockout feature on the device can result in an increased risk of DCI, which can result in personal injury or death. Disable this feature at your own risk.
• Violating a required decompression stop may result in serious injury or death. Never ascend above the displayed decompression stop depth.
• Always perform a safety stop between 3 and 5 meters (9.8 and 16.4 feet) for 3 minutes, even if no decompression stop is required.

Going Diving

1. From the watch face, press .
2. Select Activities.
3. Select Scuba Dive or Apnea Dive.

NOTE: The first time you do a diving activity, you must select the Diving category before choosing a dive type. The selected dive type is added to your favorite activities list (Customizing Your Favorite Activities List).

4. While keeping your wrist out of the water, wait until the watch acquires GPS signals and the status bar is filled (optional).

The watch requires GPS signals to save your dive entry location.

5. Review the settings on the dive pre-check screen, and press until the primary dive data screen appears.

NOTE: If necessary, you can press to edit the dive activity options, such as the gas, water type, and alerts.

6. Descend to start your dive.

The activity timer starts automatically when you reach a depth of 1.2 m (4 ft.).

NOTE: If you start a dive without selecting a dive mode, the watch uses the most recently used dive mode and settings, and your dive entry location is not saved.

7. Select an option:
   • Press to scroll through the data screens and dive compass.
   • Press to view the in-dive menu.
8. When you are ready to end the dive, ascend to the surface.

Your rate of ascent appears on the gauge.

9. Keep your wrist out of the water until the watch acquires GPS signals and saves your dive exit location (optional).
10. Select an option:
    • For a Scuba Dive activity, wait for the Auto Save Timeout timer to count down.

    NOTE: When you ascend to 1 m (3.3 ft.), the Auto Save Timeout timer begins counting down. You can press , and select Stop Dive to save the dive before the timer finishes counting down.

    • For an Apnea Dive activity, press , and select Stop Dive.

The watch saves the dive activity.

Navigating with the Dive Compass

1. During a Scuba Dive activity, press to view the dive compass.
2. Press , and select Compass > Set Heading to set the heading.

The compass indicates your directional heading with a green mark.

TIP: You can quickly set the heading by holding and .

3. Press , and select Compass.
4. Select an option:
   • To set the heading again, select Change Heading.
   • To change the heading by 180 degrees, select Set to Recip..

   NOTE: The compass indicates the reciprocal heading with a red mark.

   • To set to a 90-degree heading left or right, select Set to 90L or Set to 90R.
   • To delete the heading, select Clear Heading.

Performing a Safety Stop

You should perform a safety stop during every dive to help reduce the risk of decompression sickness.

1. After a dive of at least 11 m (35 ft.), ascend to 5 m (15 ft.).

Safety stop information appears on the data screens.

2. Stay within 2 m (8 ft.) of the safety stop ceiling depth until the safety stop timer reaches zero.

NOTE: If you ascend more than 3 m (8 ft.) above the safety stop ceiling depth, the safety stop timer pauses, and the device alerts you to descend below the ceiling depth. If you descend below 11 m (35 ft.), the safety stop timer resets.

3. Continue ascending to the surface.

Performing a Decompression Stop

You should always perform all the required decompression stops during a dive to help reduce the risk of decompression sickness. Missing a decompression stop adds significant risk.

1. When you exceed the no-decompression limit (NDL) time, begin your ascent.

Decompression stop information appears on the data screens.

2. Stay within 0.6 m (2 ft.) of the decompression stop ceiling depth until the decompression stop timer reaches zero.

NOTE: If you ascend more than 0.6 m (2 ft.) above the decompression stop ceiling depth, the decompression stop timer pauses, and the device alerts you to descend below the ceiling depth. The depth and ceiling depth flash red until you are within the safe margin.

3. Continue ascending to the surface or the next decompression stop.

Exceeding the Depth Limit

WARNING

If your watch exceeds its dive depth rating of 40 m (131.2 ft) and a dive depth limit of 45 m (147.6 ft), the watch will stop reporting depth measurements until you ascend above the depth limit.

NOTICE

If your watch exceeds the depth limit of 45 m (147.6 ft) during a dive, you will be unable to start any additional scuba diving activities for the next 24 hours.

If your watch exceeds the depth limit of 45 m (147.6 ft) during a dive, you will be unable to start any additional scuba diving activities for the next 24 hours.

After exceeding the depth limit in a dive, the Scuba Dive activity is unavailable for 24 hours to prevent inaccurate guidance. You cannot disable the Deco Lockout feature after violating the dive depth rating of the watch (Advanced Dive Settings).

Dive Settings

You can customize the dive settings based on your needs. Not all settings are applicable for all dive modes.

From the watch face, press , select Activities, select a dive activity, press , and select Activity Options.

Advanced Settings: Customizes advanced settings for diving activities (Advanced Dive Settings).

Apnea Discipline: Sets the discipline type for apnea diving.

Auto Save Timeout: Sets the length of time before the watch ends and saves a dive after surfacing.

Conservatism: Sets the level of conservatism for decompression calculations for scuba diving. Higher conservatism provides a shorter bottom time and a longer ascent time.

Display Settings: Sets the screen brightness and timeout for diving activities.

Gas: Sets the gas blend used for scuba diving.

PO2: Sets the partial pressure of oxygen (PO2) thresholds, in bar, for warnings and critical alerts for scuba diving (Dive Alerts). The PO2 Warning value is the threshold for the highest oxygen concentration level that you are comfortable reaching. The PO2 Critical value is the threshold for the maximum oxygen concentration level that you should reach.

Pool Mode: Enables pool mode for scuba diving. When the watch is in pool dive mode, the decompression lockout feature functions normally, but dives are not saved to the dive log.

Safety Stop: Sets the safety stop duration for scuba diving.

Water Type: Set the water type for diving activities.

Advanced Dive Settings

You can customize the dive settings based on your needs. Not all settings are applicable for all dive modes.

From the watch face, press , select Activities, select a dive activity, press , and select Activity Options.

Auto Dive: Automatically starts a dive activity based on your last dive type when you begin your descent. You can use the Snooze option to temporarily disable this feature.

Double Tap to Scroll: Scrolls through the dive data screens when you double tap the watch. If you notice accidental scrolling, you can use the Sensitivity option to adjust the responsiveness.

UP Key: Enables the button during dive activities to prevent inadvertent button presses.

Wrist Heart Rate: Enables the wrist-based heart rate monitor for dives.

Compass: Calibrates and sets the north reference for the compass (Calibrating the Compass Manually).

Satellites: Sets the satellite system to use for dive entry and exit locations (Satellite Settings).

Deco Lockout: Enables the decompression lockout feature. This feature prevents scuba dives for 24 hours if you violate a decompression ceiling for more than three minutes.

NOTE: You can still disable the decompression lockout feature after violating a decompression ceiling. You cannot disable the decompression lockout feature after violating the dive depth limit of the watch (Exceeding the Depth Limit).

Altitude Diving

At higher altitudes, the atmospheric pressure is lower, and your body contains a larger amount of nitrogen than it would at the start of a dive at sea level. The device accounts for altitude changes automatically using the barometric pressure sensor. The absolute pressure value used by the decompression model is not affected by the altitude or the gauge pressure displayed on the watch.