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NAUI Scuba Diver 204 APPENDIX Buddy System 27. Discuss the dive before you get in the water and agree on the location, purpose, activity, and general course you will follow underwater; maintain your same position relative to each other for your entire dive; establish your direction of travel underwater and then follow that heading until you or your buddy suggest a change with a clear signal. 28. Get yourself vertical in the water and do a slow 360° turn looking for your buddy or their bubbles, rise about three meters (10 feet) in the water and do another 360° turn looking for your buddy or their bubbles, ascend slowly to the surface after a minute if you do not see your buddy, surface, note your position relative to two points on the shore, and wait for your buddy, when your buddy surfaces, get back together and continue your dive, signal for help if your buddy does not surface. Communication 29. Hand signals, slate, rapping, or touch. 30. Visual signals or audible signals. 31. Answer it with a distinct hand signal. 32. Signals must be discussed and agreed upon before the dive. Handling Scuba Equipment in the Water 33. You want to be positively buoyant at the surface and negatively buoyant at the bottom. 34. Keeping the hose inside your arms. 35. Hold the belt by the free end, keep your body between the belt and the bottom. Navigation 36. Ripple marks, sun and shadows, surge, landmarks. 37. Align the compass with your body, keep the compass level, sight across the compass. 38. A heading 180º from your original heading (the opposite direction from which you started). CHAPTER 4 Density and Its Effects 1. 20.9%, nitrogen. 2. False. 3. False. 4. Streamlining. 5. Larger, closer. 6. False. Buoyancy 7. Weight of your body, the weight of your gear (diving suit, weight belt, and scuba unit), body size, the thickness of your diving suit, and the volume of your gear. 8. Change amount of weight worn, change amount of air in BC, change amount of air in lungs. 9. Decrease. 10. Decrease. Pressure 11. 10.3 meters (34 feet), 10 meters (33 feet). 12. 5 times. 13. 3 atm. Air Quantity in Balloon Pressure Volume Density Doubles Halves Doubles Triples One third Triples Halves Doubles Halves Quadruples One fourth Quadruples Air Consumption 14. Depth, physical activity, physical size, mental state, warmth of diving suit. 15. Submersible pressure gauge. Squeezes and Blocks


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