Suunto D4f has the following dive modes:
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.
Dive mode can be turned off during periods when you do not need a dive computer.
To change dive modes:
Each dive mode has its own settings which you need to adjust while in the given mode.
To modify dive mode settings:
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:
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:
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: