Requiredknowledge Physics and physiology direct effects of pressure buoyancy pressure/volume relationships air consumption how pressure affects density how pressure affects air spaces indirect effects of pressure ingassing and offgassing decompression sickness nitrogen narcosis oxygen toxicity carbon monoxide toxicity hypo/hyperthermia Decompression Illness (DCI) ingassing/offgassing nitrogen residual nitrogen dive planning to avoid DCI signs and symptoms of DCI first aid Effect of diving environment on scuba activities tides currents waves and surf water conditions visibilities entry and exit points bottom conditions marine life Non-decompression dive tables Selection and preventative maintenance of scuba equipment Diver first aid, and missing diver procedures Underwater communication systems Factors affecting the planning of safe diving activities Requiredskills Select, check, assemble, and don equipment Pre-dive gear check for self and buddy Entries and exits Remove and replace weight belt on surface Remove and replace equipment on surface Give, recognise and respond to underwater signals Dive with minimal impact on environment Ability to swim 100 metres on the surface wearing scuba equipment Mask and regulator removal, recovery and replacement Use of buddy system Buoyancy control Underwater navigation (natural and compass) Emergency procedures tired diver assist sharing air controlled emergency swimming ascent unconscious diver rescue |