Suunto D4f User guide

Dive modes

Suunto D4f has the following dive modes:

• Free: for free diving
• Off: turns dive mode off completely; the dive computer does not automatically switch the dive mode when submerged and dive planning mode is hidden

By default, Free mode is activated when you enter dive mode. You can change which mode is activated or turn dive mode off under the general settings.

To change dive modes:

1. While in time mode, keep DOWN pressed.
2. Press SELECT to enter Dive Mode.
3. Change to the desired mode with UP or DOWN and confirm with SELECT.
4. Press MODE to exit.

Each dive mode has its own settings which you need to adjust while in the given mode.

To modify dive mode settings:

1. While in a given dive mode, keep DOWN pressed.
2. Press DOWN or UP to scroll through the settings.
3. Press SELECT to enter a setting.
4. Adjust the setting with DOWN or Up and confirm with SELECT.
5. Press MODE to exit.

Free mode

With Free mode, Suunto D4f can be used as a freediving instrument. The dive time is indicated in minutes and seconds in the center of the display.

The free dive starts at 1.2 m (4 ft) and ends when your depth is less than 0.9 m (3 ft).

Free mode has the following settings:

• Depth notifications (see Depth notifications)
• Depth alarm (see Depth alarm)
• Dive time alarm (see Dive time alarm)
• Surface timer (see Surface countdown timer)
• Sample rate (see Sample rate)

Depth notifications

You can define up to five independent depth notifications for freediving, for example, to alert you to start free falling or mouth filling. Each notification has a defined depth and can be turned on or off.

When you reach the notification depth, the backlight blinks and the low priority audible alarm sounds.

To define depth notifications:

1. While in Free mode, keep DOWN pressed.
2. Press SELECT to enter the Depth Notify settings.
3. Scroll through the notifications with DOWN or UP and enter a notification with SELECT.
4. Press DOWN or UP to toggle the notification On/Off and confirm with SELECT.
5. Adjust the depth with DOWN or UP and confirm with SELECT.
6. Scroll to the next notification to modify or press MODE to exit.

Surface countdown timer

While freediving, you can use the surface countdown timer to help you prepare yourself for you next dive. Suunto D4f starts the countdown as soon as you reach 1.2 m (4 ft).

To set the surface countdown timer:

1. While in Free mode, keep DOWN pressed.
2. Press UP to scroll to Surf. Time Notify.
3. Press DOWN or UP to toggle the timer on and confirm with SELECT.
4. Adjust the countdown duration with DOWN or UP and conform with SELECT.
5. Press MODE to exit.