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After the automatic checks, Suunto D4i enters surface mode. At this
point, you should perform your manual checks before entering the
water.
Ensure that:
1. Suunto D4i 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.
3.1.1 Wireless Transmitter pre-check
If the optional wireless tank pressure transmitter is used, check that:
1. Tank gas and O
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settings are correct.
2. The transmitter is properly installed and the tank valve is open.
3. The transmitter and Suunto D4i 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 air for your planned dive. Check the pressure
reading against your back-up pressure gauge.
3.1.2 Battery indicators
Temperature or internal oxidation can affect the battery voltage. If
you store your Suunto D4i for a long period or use it in cold
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