Snorkelling Flashcards
Name the parts of a snorkel
Pipe/ tube, air valve, snorkel clip, purge valve, mouthpiece
What material is a wetsuit made of
synthetic rubber/ neoprene
Benefits of a wetsuit
Doesn’t let water come through, keeps body warm, tight neck seal
What are the 2 methods of equalisation
- Pinch nostrils and blow gently into nose, not too forcefully-can lead to inner ear damage
- Pinch nostrils, place lower teeth in front of upper teeth, close mouth and blow and swallow at the same time
What is equalisation?
Equalisation is equalising the pressure in your ears to the pressure in the surrounding water
Ways to predict change in weather
Wind direction and strength
Type and cover of cloud
Temperature change
Changes in air pressure
What are isobars
A line that joins areas of equal atmospheric pressure.
When close together, more wind
When far apart, no wind
Name the parts of a mask
Lens, seal, strap, nose
Is wind direction calculated where it comes from or where it’s blowing to
Where it comes from
How does high and low pressure system work
High- anticlockwise, blowing outwards
Low- clockwise, blowing towards L
What are the best conditions for snorkelling?
When tides out, when water is flat, least amount of movement on the water
Difference between onshore and offshore waves
Onshore wind blows from the sea and offshore blows from opposite where the waves are coming from
What are the 3 factors that determine a swell
Wind strength
Fetch (distance)
Time the wind blows for
Draw out dive flag (international- Australia and USA)
:)
What is the buddy system, why have it?
Term
The buddy system when you are paired up or teamed up and have the responsibility to look out for each other. We have it to ensure the safety of each other when snorkelling, diving, ect. The term used is ‘one up, one down’
Describe positive, neutral and negative buoyancy
Positive is floating,
Negative is sinking,
Neutral is neither
Duck diving procedure
Start lying flat on surface of water, bend torso under water then lift your legs up into the air, proceed to go under water
3 types of waves and it’s face name
Plunging/dumping waves- curling face
Spilling waves- sloping face
Surging waves- sloping face
Describe plunging/dumping wave
Break with force, can throw swimmer to bottom, usually shallow water
Describe spilling waves
When the crest (top) tumbles down the face front of wave. Safest waves
Describe surging waves
May never break. Don’t lose speed or gain height. Can knock people off their feet and carry them back into deep water. Can be dangerous, especially around rocks ect.
Why do waves break?
As the sea floor becomes shallow, it forces the wave to topple over and break
What is a littoral current?
A littoral current is when the water is flat but has a strong pull towards the rip, therefore, the swimmer doesn’t know they’re in danger
What is a rip?
A rip current is a body of water moving out to sea
What are 2 signs of a rip?
Discoloured sand due to it being stirred up by the rip
Debris moving inwards to sea
What is a spring tide?
Where the earth, moon and sun are aligned
What is a neap tide?
Where the earth, moon and sun are at right angles
Aided rescues
ASK TEACHER
Wind directions
ASK TEACHER
How long between a high tide and a low tide?
6hrs 15 mins
