Suunto D4 manual Free diving, Audible and visual alarms

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5.5. Free diving

Free diving, and particularly Free diving 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 Free diving 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, FREE DIVING AFTER SCUBA DIVING IS NOT RECOMMENDED. You should avoid Free diving, and not exceed 5 m/16 ft, for at least two hours after scuba diving.

WARNING	Suunto also recommends that you receive training in Free diving
	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.

5.6. Audible and visual alarms

The dive computer features 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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Contents Page Getting Started with Your Suunto D4 Diving Care and Maintenance of MY Suunto Diving Computer Intellectual Property Welcome to the World of Suunto Diving INSTRU- Ments Page Any confusion resulting from neglecting to follow this users Page Selected O2% and a Maximum PO2 of 1.4 BAR Have not Personally Verified ITS Contents Dive Computer will not Accept Fractional Page Suunto D4 AT a Glance Navigating in the menusButton symbols and functions Symbol Button Press Main functions ModeDown Long Enter Setting mode Time mode settings Getting Started with Your Suunto D4Setting the alarm More than 5 secondsSetting the time Setting the dual timeSetting the date Setting the unitsSetting the backlight Setting the tonesStopwatch AC water contactsPage Before Diving Suunto RGBM/Deep Stop Algorithm Emergency ascentsDive computer limitations NitroxAudible and visual alarms Free divingAlarm type Alarm reason Oxygen alarms in Nitrox mode Alarm typeError conditions Omitted decompressionDive mode settings Setting RgbmSetting the depth alarm Setting the depth notify alarm Free mode Setting the dive-time alarmSetting the nitrox values Setting the personal/altitude adjustmentsSetting the surface time notify alarm Free mode Setting the sample rateSetting the Rgbm values Setting the Deep StopsActivation and pre-checks Accessing Dive mode Dive mode activationPage Battery power indication Diving at altitudeAlt. adjustment value Altitude range How the Altitude value is setPersonal adjustments Personal ad Condition Desired tables Safety Stops Rgbm setting Desired Tables EffectRecommended Safety Stops Mandatory Safety Stops To or below Ceiling Deep stops Diving Diving in AIR mode DIVEairBasic dive data Down Button Toggles Between Maximum Depth and Current Time Ascent rate indicator BookmarkDecompression dives Ceiling, ceiling zone, floor and decompression range Page Display below the floor Display above the floorDisplay at the ceiling zone Display above the ceilingDiving in Nitrox mode DIVEnitrox Before diving in Nitrox modeDefault nitrox settings Oxygen displaysDown Button Diving in Free mode DIVEfree Oxygen limit fraction OLFThere is no ascent rate monitoring in the Free mode Day HistoryNew one Free dive time limit After Diving Alarms Symbol on displaySurface interval Dive numbering AIR and Nitrox Repetitive dive planning Free DiveFlying after diving Memory mode Dive Planning mode MEMPlan See .7. Error conditions Dive numbering shown during dive planning Dive logbook MEMLogbookBeen replaced according to the instructions Scuba History Dive history MEMHistoryFree Dive History Suunto Dive Manager SDM Page Page Care and Maintenance of MY Suunto Diving COM- Puter Water Contacts and Push ButtonsMaintenance FAQs Water Resistance InspectionWhat are Original Suunto ACCESSORIES? Page Battery Replacement By the warrantyTechnical Data Temperature displayDepth gauge Calendar clockLogbook/dive profile memory Displays only in Nitrox modeOperating conditions Tissue calculation model BatteryRgbm Diver Attention Symbol Advice to Extend Surface Interval Suunto Rgbm adaptive decompressionNo-decompression limits No-decompression time limits for various depths m No-decompression time limits for various depths ft Altitude diving Oxygen exposurePage Copyright Trademark Intellectual PropertyPatent notice User’s responsibility Disclaimers12.2. CE Page Warranty Period Exclusions and LimitationsAccess to Suunto warranty service Page Other important notices Limitation of Liability Disposal of the Device Glossary DAN DCI103 104 105 Customer Service Contacts Suunto Oy 10/2007