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35 Cards in this Set
- Front
- Back
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What is the altitude range for altitude dives?
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1000' - 10,000'. Above 10K do not use RDP tables.
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How are flying after diving recommendations different for altitude diving and regular diving?
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They aren't. 1 dive - no flying for 12 hours; multiple, no fly for 18 hours.
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What are two conditions that are in play with altitude diving?
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Hypoxia (lack of oxygen)
Hypothermia (cold) |
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What two dive accessories are especially useful in altitude diving?
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Ascent/descent lines, and slates.
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In what two ways does altitude affect buoyancy?
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(1) Altitude dives are usually fresh water, so weighting will be different than in salt water;
(2) wet suits may be more buoyant since trapped air can expand more with lower pressure. |
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As a general rule, Bourdon tube depth gauges read _______ than actual depth at altitude, and capillary gauges read _______.
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As a general rule, Bourdon tube depth gauges read *shallower* than actual depth at altitude, and capillary gauges read *deeper*.
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How are ascents different at altitude?
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(1) Ascent rate is HALF - 30 feet per minute;
(2) Safety stop is required on ALL dives. |
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What is the maximum number of repetitive dives in a day at altitude?
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Two.
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When arriving at altitude and diving right away, how do you adjust RDP use?
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Your starting pressure group is two groups for each 1000'. If you wish you can then calculate a surface interval for how long you have been at altitude. Above 8,000 feet you MUST wait 6 hours to dive.
For example, a diver goes from sea level to 3,644 feet. They are pressure group H. |
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How do you calculate the theoretical depth at altitude?
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Round the actual depth up and the altitude up, if necessary, and consult the table for the theoretical depth. Use this depth in the RDP, which often requires rounding up again.
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What is the maximum depth recommended at altitude?
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Maximum THEORETICAL depth of 130'` on all dives; max theoretical of 100' is recommended.
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At altitude, are safety stops at 15', shallower, or deeper?
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Safety stops are at 15' theoretical, which works out to shallower in-water (e.g., 11 feet at 8000' altitude).
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What are five activities that can be enjoyed during deep diving?
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Wreck diving
Drift diving Underwater photography Recovering lost objects Visit aquatic life that lives deep |
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What is a recreational deep dive?
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Between 60' and 130'.
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What are four reasons 100' is recommended as the optimal depth limit
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Narcosis risk reduced
Gas consumption reduced, extending dive time Greater risk of DCS Reduced light at depth |
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How do you ensure your equipment is acceptable for deep diving?
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Have reg serviced regularly
Have SPG serviced regularly Use tanks of 71.2 cu. ft. or more Check BCD for leaks Use appropriate exposure suits |
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What are five pieces of specialized equipment recommended for deep diving?
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Descent/ascent line
Extra air at safety stop Spare weights at 15' Dive light First aid and emergency oxygen |
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How do you set up a deep diving support station, with and without a boat?
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station = extra oxygen and weights at safety stop.
Boat - dangle from boat No boat - hang from float |
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What six guidelines should you follow with a dive computer?
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Never share computers
Dive to most conservative one Get computer serviced regularly Carry tables for backup Use computer as no-decompression device If computer fails, follow mfg instructions Let DM know you have computers since it may extend dive time |
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What are two techniques for maintaining contact with your buddy when deep?
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Use a buddy line
Watch each other on descents and ascents, stay within touching distance |
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How should you weight yourself when diving deep?
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Holding normal breath, weight to float at eye level, add 5 lbs
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What are two ways you can stop or slow yourself using an ascent line?
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Hook with elbow
Hook with leg |
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How should you breathe while deep diving?
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Slowly and deeply.
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What are two ways for estimating the 60' per second ascent rate?
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Use computer
Use timer and SPG, should be ten seconds to ascend 10 feet |
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What three areas of preparation assist in self-rescue?
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Physical preparation
Mental preparation Equipment preparation |
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How to best prevent problems?
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Maintain your equipment properly
Anticipate problems Don't ignore small problems |
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Prevent or control UW problems by:
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Relax when you dive
Keep close eye on air supply Dive within your limitations Dive well within the table or computer limits |
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What are the most common problems UW?
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Overexertion
Running low/out of air Regulator free flow Entanglement |
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What to do if you run out of air?
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1. Make a normal ascent
2. Ascend with alternate air source 3. CESA 4. Buoyant emergency ascent |
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What are the steps in a primary assessment?
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A - Assess, Apply barriers, Alert EMS, Airway opn
B - Breathing check C - Circulation, Chest Compressions D - Defibrillation S - Shock, Spinal injury, Serious bleeding |
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First aid for DCI?
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- Primary assessment
- Maintain ABCD'S if unresponsive - If responsive, give oxygen, get the dive particulars - Protect from excess heat/cold, keep lying down |
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When should you use in-water recompression?
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Never.
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Treatment for near-drowning?
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- Immediate rescue breaths
- CPR if no heartbeat - Be alert for vomiting - If breathing, give oxygen - Contact EMS |
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What is secondary drowning?
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When inhaled water washes away lung surfactant, collapsing the lungs. Anyone near-drowning must be hospitalized.
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How to approach serious bleeding?
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- Put on barriers
- apply direct pressure with sterile bandage - If bandage becomes soaked, add more, don't remove - Release pressure periodically to see if bleeding has slowed or stopped |
