SUUNTO D9tx - Manual (Page 42)

5.4. Freediving
Freediving, and particularly freediving in combination with scuba diving, may present
risks that have not been researched and are not commonly known.
Anyone who engages in any form of breath hold diving is in danger of shallow-water
blackout (SWB), that is, the sudden loss of consciousness caused by oxygen starvation.
Any breath hold diving results in some nitrogen build-up in the blood and other fast
tissues. Due to the short time spent at depth, this build-up is generally not significant.
Therefore, provided the effort involved in freediving has not been severe, there is little
risk in diving after breath hold diving. However, the reverse is more unknown and may
significantly increase the risk of DCI. Therefore, FREEDIVING AFTER SCUBA DIVING
IS NOT RECOMMENDED. You should avoid freediving, and not exceed 5 m/16 ft, for
at least two hours after scuba diving.
WARNING
Suunto recommends that you receive training in freediving
techniques and physiology before conducting breath hold
dives. No dive computer can replace the need for proper dive
training. Insufficient or improper training may cause a diver
to commit errors that may lead to serious injury or death.
5.5. Audible and visual alarms
The dive computer has audible and visual alarms that advise when important limits
are approached or that prompt you to acknowledge preset alarms. The table below
describes the different alarms and their meanings.
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