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JQ: Why do you think that emoji’s have become so popular to use?
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1:4 WATER SAFETY
1. Swim with a buddy
2. Fly a dive flag
3. Wear a life jacket in the boat and stay with the boat if capsized.
4. Know your limits - tired, cold divers make more errors
5. Avoid panic and prepare for emergencies
6. Let someone on shore know your plans
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Water temperature is a big factor for survival that experience, training and safety procedures can not overcome.
at 80o indefinite time limit in the water
at 60o 2-24 hour time limit
at 50o 30 minutes to 3 hours limit
at 32o less than one hour limit
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SCUBA is an acronym for the Self Contained Underwater Breathing Apparatus invented by Cousteau.
Diver certification is required to avoid the dangers that proper training can prevent.
Link:
Dangers
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1. Decompression sickness (the Bends) - caused by surfacing too rapidly for excess nitrogen in your blood to be eliminated by breathing.
The result is bubbles that expand and damage body tissue or cause pain.
Divers learn to surface slowly and when to make necessary decompression stops.
2. Nitrogen narcosis (different than decompression sickness) - at depths, nitrogen is forced into the blood stream and has an anesthetic quality that impairs judgment and may cause the diver to become unconscious.
The depth that narcosis occurs depends on the experience of the diver and the length of the dive.
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NAVIGATIONAL AIDS
Can
left channel - green
Nun
right channel - red
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Left day markOdd numbers
Right day markEven numbers
DAYMARKS
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“Red - Right - Returning” is a phrase used remind sailors how to navigate home using navigational aids.
Knots = term used for speed in mile/hr
1 land mile = 5,280 feet
1 nautical mile = 6076 feet because it is the distance of one minute of latitude or 1/60th of a degree.
Three nautical miles is a league and 6 feet is a fathom.
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SEMAPHORE –
Alphabetical flags used for signaling
MARLINSPIKE IS THE ART OF TYING KNOTS
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SEMAPHORE - WARNINGS
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Small Craft Warning Storm Warning Stop your vessel immediately
Diver down, keep clearInternational Code
Require AssistanceDiver Down
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NAUTICAL TERMS
Wharf
Pier
Shore Dock
Stern
WaterlineStarboard (Right Side/Green)
Bow
Transom
Port (Left Side/Red)
Hull
Gunwale
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Motor Sail
Pros
Cons