Open Water 2 Flashcards
Objects appear closer or further underwater?
Closer/bigger than they are due to refraction when light enters the air in your goggles
Colors fade underwater in what order?
ROYGBIV.
Red fades first (~15 ft) while violet fades beyond ~250 ft
How does sound change?
Sound travels much more effectively. It may be hard to tell where sounds are coming from.
At what temperature do you need an exposure suit?
Basically all of them. Even at 85 F it’s still below body temperature and you lose heat 20x faster than in air
How do you breathe to prevent residual water in the regulator from getting in to your mouth?
- Breathe slowly
OR - Look down slightly and hold your tongue to the roof of the mouth while breathing
Signs of overexertion
Fatigue Labored breathing A feeling of suffocation or air starvation Weakness Anxiety Headache Muscle cramping A tendency to panic
What are the 9 minimal components of a dive plan?
Agree on the best entry and exit techniques for the environment.
Decide what course you’ll follow.
Agree on the maximum time and depth.
Review underwater signals and other communications.
Determine when you will turn the dive and head back based on your remaining air, time and/or other factors – whichever comes first.
Agree on how you’ll stay together during the dive (e.g., swim side by side, one leads while the others follow, etc.).
Establish what you will do if you become separated.
Discuss emergency procedures.
Agree on an objective. An objective may be detailed, such as “shoot videos of butterfly fish pairs,” or as simple as, “let’s go for a look.”
What is the predive check acronym?
BWRAF
What does Begin With Review and Friend (BWRAF) mean?
Begin - B - BCD (check your BCD)
With - Weight (make sure your weight is balanced and ready)
Review - Releases (make sure your Releases are good in case you need to ditch any equipment)
And - Air (take some test breaths from your regulator, find where buddy’s backup regulator is in case it becomes necessary
Friend - Final Check (do a final inspection of everything, make sure it’s looking good)
For a longer swim, is it more tiring face up or face down?
Face down. Swimming on your back makes it harder to see where you’re going but may be less tiring
When descending with a reference (e.g. mooring line from the boat) should you hold it?
Generally no, it’s just a visual reference.
Though if current is strong, maybe hold.
As you go deeper, what happens to your buoyancy?
Generally decreases and you may begin to descend faster. May need to adjust bcd accordingly.
5 Steps of Descending
- Confirm buddies are ready
- Orient yourself to something, like a landmark or the boat
- Start using regulator
- Activate dive computer or timer if needed
- Slowly deflate BCD
5 Points of Ascending
- Signal “Up” and confirm buddies are ready
- Check dive computer to be sure you’re within limits
- Do not add air to BCD, but hold up hose. Start swimming up naturally
- Ascend slowly, no faster than 18m/60ft a minute and ideally no more than 9m/30ft a minute
- Watch surroundings and buddies as swimming
How should you adjust air during ascent?
Likely will need to dump air during the climb to prevent becoming too buoyant
