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Night Diving

Night Diving. Why Do It?. Night diving allows you to see different critters and or different behaviors. It is another form of limited visibility diving and some divers find their first night dive both exciting and spooky. Learning Objectives. Describe the ideal setting for a night dive.

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Night Diving

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  1. Night Diving

  2. Why Do It? • Night diving allows you to see different critters and or different behaviors. • It is another form of limited visibility diving and some divers find their first night dive both exciting and spooky.

  3. Learning Objectives • Describe the ideal setting for a night dive. • Discuss night diving techniques, including the importance of navigation during a night dive. • State the minimum number of lights each diver should carry during a night dive, and explain why. • Demonstrate standard light signals, and discuss light etiquette. • Discuss features to be considered when selecting a dive light, including re-chargeable vs, non re-chargeable batteries.

  4. Main Points • Ideal setting • Buddy techniques • Communications • Light etiquette • Navigation • Avoiding disorientation • Required equipment • Lighting concerns

  5. Ideal Setting • Familiar site • Favorable conditions • Boat

  6. Buddy contact • Good buddy techniques • Positioning • Plan the dive and dive the plan • Personal identification lights • Separation plan

  7. Communications • Light signals • OK • Attention • Distress • Diver-to-diver • Diver-to-shore or boat

  8. Light Etiquette • If the light is in your hand, it should be on. • Don't shine your light in your buddy's eyes. • Don’t shine the light in your eyes. • Control the light during descent.

  9. Navigation • More important at night than during daylight • Surface • Use compass and range lights • Make sure you can identify the exit point. • Underwater • Plan your pattern and stick to it. • Don’t try to cover too much area.

  10. Disorientation • Most significant problem • bubble trail • descent/ascent line • buddy • bottom • kelp • Breathing • Water in mask

  11. Required Equipment • All standard gear for daylight diving plus • 2 dive lights per diver • Purpose of the second light? • 1 ID/marker light per diver.

  12. Dive Lights: • primary vs. backup • purpose/function • beam pattern • ease of use • size • maintenance • store with batteries out • lubricate "O" rings • store with pressure off "O" rings • filament most vulnerable when light is on

  13. Rechargeable Batteries • Batteries die suddenly (little warning) • One charge doesn't last as long as standard battery • Battery Memory: • If you charge battery before it is completely drained, eventually the battery won't hold a charge as long. • Batteries may swell during charging, to the point that they won't fit in the light. • Batteries may spike when freshly charged. • Turn light on and leave it on to take the edge off. • If the battery hasn’t been used in a while the first charge won’t last as long as normal.

  14. Personal ID lights • Strobe lights • Chem/ID Lights: • color code dive teams • position for maximum visibility

  15. Surface Lights • Ranges • Float or boat marker light • Flashing • Dressing area • Be aware of background light

  16. Have We Covered • Ideal setting • Buddy techniques • Communications • Light etiquette • Navigation • Avoiding disorientation • Required equipment • Lighting concerns

  17. Can You • Describe the ideal setting for a night dive. • Discuss night diving techniques, including the importance of navigation during a night dive. • State the minimum number of lights each diver should carry during a night dive, and explain why. • Demonstrate standard light signals, and discuss light etiquette. • Discuss features to be considered when selecting a dive light, including re-chargeable vs, non re-chargeable batteries.

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