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Night Diving

Night Diving

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Night Diving

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Presentation Transcript

  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.