NAUI Scuba Diver 76 Diving Skills utes to do a precautionary decompression stop (figure 3-50). If you can perform the stop while hanging onto a line or by following the contour of the bottom, it makes the stop easier. 9. Proceed to the surface, inflate your BC, switch from your regulator to your snorkel if desired, and record the time you surfaced. When you first start diving, it will help if you time your ascents and compare the ascent time with your depth gauge so you can determine your rate of ascent. You must develop a feel for the correct rate. Your instructor will help you do this. A slow ascent rate is important because the dive tables are based on a slow ascent rate. If you rise too quickly, decompression sickness can result. Verify What You Have Learned Review the following questions about buoyancy: 18. What are three steps you should take to prepare for a descent? _____________________ _______________________________ _______________________________ _______________________________ _______________________________ 19. What three actions do you perform on every descent? _________________________ _______________________________ _______________________________ _______________________________ 20. What three actions do you perform on a normal ascent? ____________________ _______________________________ _______________________________ _______________________________ _______________________________ 21. Four major factors that affect your buoyancy are ___________________________, ______________, _______________, and ___________________________. 22. On ascent, as the air in your BC or dry suit starts to expand, you must _____________________________ _____________________________. FIGURE 3-49. YOUR NORMAL ASCENT SHOULD ALWAYS BE SLOW AND CONTROLLED. FIGURE 3-50. IF YOU ARE PROPERLY WEIGHTED, YOU SHOULD BE ABLE TO HOVER AT 4 METERS (15 FEET) WITH 34 BAR (500 PSI) OR LESS OF AIR IN YOUR CYLINDER FOR A PRECAUTIONARY DECOMPRESSION STOP.
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