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

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