such as “OUT OF RANGE” (figure 5-27). If this occurs, you must begin your ascent immediately. Your computer will give you the information you need to complete your decompression and ascent. The computer might also prevent you from using the computer for 24 hours. You should plan your dives and then dive your plan so that you never see a message such as “OUT OF RANGE.” Decompression You should never see the ceiling display. When your dive computer displays a ceiling, it means that you have an obligation to decompress. The ceiling depth is the depth of your first decompression stop. You must not ascend above the depth of that ceiling. You can be 0.3 or 0.6 meters (1 or 2 feet) deeper, but you must not be shallower. If you require more than one decompression stop, your computer will display another ceiling at a shallower depth than the first stop. You must complete this stop, as well as any others, until your computer displays a zero ceiling or no ceiling at all. Planning Repetitive Dives During your surface interval, your computer will give you credit for offgassing. If you monitor your display as it is scrolling, you will see that the maximum time allowed at any depth increases as you stay out of the water. A surface interval of at least one hour is still recommended even if you are using a computer. When you are rested and ready to do a repetitive dive, look for the depth of your planned dive as the computer is scrolling and see how long the computer will allow you to stay at that depth. Safe to Fly Indicators Most computers will tell you when it is safe to fly based on their mathematical model. The computer might show an icon of an airplane or the words “TIME TO FLY” with hours and minutes listed beside it. The computer is telling you how long you must wait before it is safe to fly. When you no longer see an airplane or the words “TIME TO FLY,” it is safe to fly. NAUI and most medical diving authorities recommend that you be conservative when flying after diving, especially if you have been on a multiday diving trip. You should plan your trip so that you have at least 24 hours on the surface before you need to fly. Logging Your Dives Even if you use a computer, you still need to log your dives. Some computers will allow you to download the information so you can keep your dive log on your personal computer. Others only hold a few dives in their memory so you should get in the habit of transferring NAUI Scuba Diver 146 Decompression, Dive Tables, and Dive Computers FIGURE 5-26. ALL DIVE COMPUTERS WILL GIVE YOU A WARNING SIGNAL WHEN YOU EXCEED THE ASCENT RATE. FIGURE 5-27. YOU SHOULD NEVER SEE THIS WARNING ON YOUR COMPUTER. IF YOU DO, BEGIN YOUR ASCENT IMMEDIATELY AND FOLLOW YOUR COMPUTER’S INSTRUCTIONS.
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