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37 terms

SCUBA Section 3

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Descent in Open Water
Slowly deflate your BCD and exhaling. Make sure your head is above your feet. Equalize air spaces often and check your buddy.
Panicking at surface of water
If you are on a boat, throw them something with a rope on it so you can pull them aboard. If they aren't breathing, perform cpr, and if you don't know it, yell for help or call someone.
Conditions that affect you when diving (6)
1) temperature, 2) visibility, 3) water movement, 4) bottom composition, 5) aquatic life, and 6) sunlight
What is a thermocline?
An abrupt change to a layer of colder water
Waves create surge which you avoid by ______.
Going deeper.
Longshore currents tend to ________.
Push you parallel to the shore.
You can recognize a rip current by ________.
Foamy water, strong flow away from shore, and disruption of waves.
If caught in a rip you should _______.
Swim parallel to shore.
An upwelling tends to cause _______ dive conditions.
Excellent.
Tides effect dive conditions by _______.
Causing currents and affecting visibility.
Generally the best tidal level for diving is ____.
High tide.
4 Steps to assist another diver
1) Establish ample buoyancy.
2) Calm diver
3) Help diver reestablish breathing control
4) Assist diver back to shore or boat.
Panicking at surface of water
If you are on a boat, throw them something with a rope on it so you can pull them aboard. If they aren't breathing, perform cpr, and if you don't know it, yell for help or call someone.
With an unresponsive diver, what is the primary concern?
checking for breathing, and begin rescue breaths if not breathing.
If a diver loses consciousness or becomes unresponsive, what do you do?
bring the diver to the surface and check for breathing
If a diver shows symtoms of lung over expansion, what do you do?
Do the same as if the diver looses consciousness, unless if they dont loose consciousness, keep them on their side
When you make changes to your buoyancy, at what speed should you make changes, and why?
Slowly, if you go too quickly then you may lose control of your buoyancy
What do panicked divers typically do?
push off masks and spit out regulators
If you have a problem at the surface, you should..
Establish positive buoyancy and ask for help.
What is the head?
Bathroom on a boat
What is the bow?
Front of the boat
What should you do if you find poor conditions at your dive site?
Try your alternate site, and if it is bad, cancel the dive
What are two types of interactions that you can have with aquatic life?
passive, active
Nearly all injuries from aquatic life result from ______
diver carelessness
What do you do if you see an aggressive animal underwater? (2)
Watch it, leave the area calmly
Why should you follow fish and game laws?
To help assure future populations of game animals
To avoid injuring aquatic animals, you should (3)
1) wear an exposure suit and gloves, 2) what where you put your hands, feet and knees, 3) don't touch anything you don't recognize
How do you avoid bottom contact? (2)
1) Remain neutrally buoyant, 2) Swim with your feet up off the bottom
What are the 6 general types of bottom compositions?
1) silt, 2) mud, 3) sand, 4) coral, 5) vegetation, 6) rock
What causes currents? (3)
waves, wind, tides
If there is a current, you should begin your dive _______
swimming against the current
What is underwater visibility?
the approximate distance you can see horizontally
What are the three factors that affect underwater visibility?
1) water movement, 2) suspended particles, 3) bottom composition
What three things can restricted visibility cause?
1) buddy separation, 2) disorientation, 3) loss of direction
When you are diving in clear water, you should use a ___________ or ___________ when ascending and descending.
line, other reference
As you descend the water temperature gets ______________
cooler
If you know there's a thermocline, in dive planning you should_______________
Choose your exposure protection based on the temperature at depth