Welcome Atlantic Edge Dive Center Refresher Course Welcome.
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Transcript of Welcome Atlantic Edge Dive Center Refresher Course Welcome.
Welcome
Atlantic Edge Dive Center
Refresher Course
Welcome
Atlantic Edge Dive Center
Training Equipment Service Travel Let Atlantic
Edge’s super staff be your dive consultants!
Atlantic Edge - Refresher
Let’s Get Started
Paperwork Liability Release
Scuba concepts, science and theory
Quiz 1A
Atlantic Edge - Refresher
Effects of Increasing Pressure
Air spaces most affected by increased
pressure – ears, sinuses and mask
As water pressure increases with descent,
volume decreases
If you continue to descend you will feel
a squeeze on your air spaces
To avoid discomfort –
equalize early and often
Atlantic Edge - Refresher
+
Equalization Techniques
Equalize every metre/few feet while descending
before you feel discomfort
Pinch your nose and blow gently - wiggle your
jaw
If you have difficulty equalizing
Ascend a few feet
and attempt to equalize
Be patient and gentle,
or end the dive
Atlantic Edge - Refresher
Effects of Decreasing Pressure
Expanding air can cause lung over expansion
–
lung rupture
Lung over expansion can lead to
severe injuries including
paralysis and death
To avoid this, permit the pressure
to equalize - breathe normally
Atlantic Edge - Refresher
Most Important Rule
The lungs can be injured by even minimal
pressure changes if you hold your breath
It’s important to always breathe continuously
when using scuba - even in shallow water
The most important rule in scuba diving is to
“Breathe continuously
and never, never
hold your breath”.
Atlantic Edge - Refresher
Decompression Sickness
Bubbles blocking blood circulation after diving
is called decompression sickness (DCS)
Variables: Depth, dive time and diver condition
Use extra caution with: age, obesity, lack of
physical conditioning
Stay well hydrated
Dive within the limits of dive tables
and computers
Atlantic Edge - Refresher
Safety Stops
A safety stop provides extra time for your body
to eliminate nitrogen – a good idea on any
dive
A safety stop is required if:
The dive is 30 metres/100 feet or deeper
Within three pressure groups
of a no decompression limit
You reach any limit on the
RDP or your computer
Atlantic Edge - Refresher
Nitrogen Narcosis
Nitrogen narcosis:
Impairs a diver’s judgment and
coordination
May cause a false sense of security
May cause a disregard for safety
May cause anxiousness and poor decisions
Immediately ascend to shallower depths
to relieve the narcosis
Atlantic Edge - Refresher
Flying After Diving
Flying after diving recommendations:
Wait a minimum surface interval of 12
hours prior to ascent to altitude
If you plan to make daily, multiple dives for
several days or make dives requiring
decompression stops, you should wait for
an extended surface interval beyond 12
hours
Atlantic Edge - Refresher
BUOYANCY: Positive, Negative & NEUTRAL!
Why? Safe on surface Streamlined UW Protect the environment
Variables? Body weight, size &
composition Equipment Water: salt v. fresh
How do you determine your optimal weight requirements?
Fine tune with your breathing!
New Open Water student, perfecting her buoyancy in Turks and Caicos.
Overexertion
Know your limits and pace yourself to avoid
breathlessness
If you experience overexertion symptoms
underwater - stop all activity, breathe
deeply and rest
Hold onto an object for support, if possible,
and relax until your breathing returns to
normal
Atlantic Edge - Refresher
Heat Loss Underwater
Left unchecked, body heat loss can lead to hypothermia
To avoid hypothermia – wear exposure protection
suitable for the environment
When you begin to shiver continuously –
get out of the water immediately,
dry off and seek warmth
Atlantic Edge - Refresher
Surface Problem Management
Control or prevent surface problems by:
Diving within limitations
Relaxing while you dive
If you have a problem at the surface –
immediately establish positive buoyancy
by inflating the BCD or dropping weights
Call for help if needed
Atlantic Edge - Refresher
Buddy System / Dive Plan
Avoid problems :
Agree on entry, exit points
and dive objective
Agree upon time & depth
limits
Review communications
Discuss emergency
procedures
Discuss how to stay together
&
what to do if separated…
… Search One Minute then Surface!
A dive plan:
Is simple and should be
flexible
Takes only minutes to
discuss
Can offer plenty of options
depending on what you find
underwater
… Plan your dive and dive your
plan!
Atlantic Edge - Refresher
Local Wisdom
To dive in an area for the first time - get an
orientation to the local area
The PADI Discover Local Diving experience is
one way to do this
Find out:
What’s interesting about the site
What to watch for
Unique dive skills or procedures
Atlantic Edge - Refresher
Fragile Environment
Minimize accidental damage :
Swim next to reef rather than above it
Watch your buoyancy – don’t dive over
weighted
Turn sideways to look under ledges
Keep your hoses secured
Respect all Marine Life!
Atlantic Edge - Refresher
Aquatic Animals
Avoid potential problems with aquatic life:
Treat all animals with respect
Be cautious in extremely murky water
Avoid wearing shiny, dangly jewelry
Remove any speared fish from the water
immediately
Wear gloves and an exposure suit
Maintain neutral buoyancy – move slowly and
carefully
Avoid contact with unfamiliar animals
Atlantic Edge - Refresher
Test Your Knowledge
Test your understanding of Diving Theory with a Quick Quiz
Quiz 1A
Now, Let’s Get Wet!
Pool Review the basics Check out your
gear Fine tune your
buoyancy Review Sticker for
logbook Nitrox or other
Specialties
Atlantic Edge - Refresher