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Open Water - Final Review

Open Water - Final Review. Buoyancy – Fresh/Salt Density/Pressure/Volume Squeeze/Reverse Block Number 1 Rule Tank at surface last 90 minutes, how long at 66 ft? Sound and sight UW DIN/Yoke valve, how to take care of a tank Hand Signals Buddy separation protocol

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Open Water - Final Review

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  1. Open Water - Final Review • Buoyancy – Fresh/Salt • Density/Pressure/Volume • Squeeze/Reverse Block • Number 1 Rule • Tank at surface last 90 minutes, how long at 66 ft? • Sound and sight UW • DIN/Yoke valve, how to take care of a tank • Hand Signals • Buddy separation protocol • Out of Air order of possibilities (CESA in the middle)

  2. Out of Air Scenarios BEST WORST Controlled Emergency Swimming Ascent (CESA) Buoyant Emergency Ascent Buddy Breathing Normal Ascent Alternate Air Source

  3. Open Water - Final Review • Signs of stress – mask, jerky movement, tunnel vision, not responding • Narcosis symptoms, DCS symptoms • Risk factors for DCS • Treatment for DCS • Emergency DECO • Altitude and the RDP • Dive Computers

  4. Dive Tables - Special Rules • Flying after diving – wait 12 hours or for repetitive dives and/or multiple days wait 18 hours (suggested) • Cold – add 10 feet • 1000’ altitude limit for RDP • Safety Stop – always do a safety stop • A Safety Stop is REQUIRED for dives 100’ plus or within three letter groups of NDL, or NDL • Ascend no faster than 60 feet per minute

  5. Emergency Decompression • If a no decompression limit is exceeded by no more than 5 minutes, an 8 minute decompression stop at 15 feet is mandatory. Upon surfacing the diver must stay out of the water for at least 6 hours. • If a no decompression limit is exceeded by more than 5 minutes a 15 foot decompression stop at 15 feet is urged (air supply permitting). Upon surfacing the diver must remain out of the water for at least 24 hours before making another dive.

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