Suunto D6i User Guide

Activation and pre-checks

Unless the dive mode turned off, the dive mode activates automatically when you dive deeper than 1.2 m (4 ft). However, you should switch to dive mode before diving to check altitude and personal settings, battery condition and so on.

Each time your Suunto D6i enters dive mode, a series of automatic checks are performed. All graphical display elements are turned ON, and the backlight and the beep are activated. After this, your altitude and personal settings are displayed along with the maximum operating depth (MOD), gas content, and PO₂ values. Then the battery level is checked.

Between consecutive dives, the automatic checks also show current tissue saturation.

Before leaving on a dive trip, it is highly recommended that you switch to dive mode to make sure everything is functioning properly.

After the automatic checks, Suunto D6i enters surface mode. At this point, you should perform your manual checks before entering the water.

Ensure that:

1. Suunto D6i is in the correct mode and provides complete displays.
2. Altitude setting is correct.
3. Personal setting is correct.
4. Deepstops are set correctly.
5. Unit system is correct.
6. Correct temperature and depth are shown.
7. The alarm beeps.

Wireless Transmitter pre-check

If the optional wireless tank pressure transmitter is used, check that:

1. Tank gas and O₂ settings are correct.
2. The transmitter is properly installed and the tank valve is open.
3. The transmitter and Suunto D6i are paired.
4. The transmitter is sending data (wireless transmission icon blinks, tank pressure is displayed).
5. There is no transmitter low battery warning.
6. There is enough gas for your planned dive. Check the pressure reading against your back-up pressure gauge.

Battery indicators

Temperature or internal oxidation can affect the battery voltage. If you store your Suunto D6i for a long period or use it in cold temperatures, the low battery warning may appear even though the battery has enough capacity.

In these cases, re-enter dive mode and check the battery power. If the battery is low, the Low Battery warning comes on.

If the low battery icon appears in surface mode, or if the display looks faded, the battery may be too low. Battery replacement is recommended.