217 Cei ling: The minimum depth (usually displayed by a computer) to which a diver can ascend without enhanced risk of decompression sickness. Cer tification Card: A card awarded by NAUI as evidence of completing specific diver training. Cle aring: The movement of air from the lungs to other air spaces, such as the ear and the sinuses to equalize pressure. Com pass: A piece of equipment that aids in underwater navigation by indicating the direction of magnetic north from your position. Con densation: The water that forms on a surface because of the cooling of air containing water vapor. Con sole: A device designed to hold assorted gauges and instruments around or in line with the submersible pressure gauge. Cor al: A marine animal without a backbone that usually lives together with other animals of the same species and forms a colony. Many corals produce a hard external skeleton. CPR: Cardiopulmonary resuscitation. Cur rent: The flow or movement of water in a specific direction. Wind, gravity, temperature, the Earth’s rotation, and other factors cause currents. Cyl inder Valve: A mechanism used to control the flow of air in and out of a scuba cylinder. The cylinder valve includes the attachment point for a scuba regulator. D Dec ompression Stop: The specified depth and time a diver stops and waits during ascent to allow for nitrogen elimination before surfacing. Dec ompression Sickness: The adverse physiological symptoms or condition caused by the formation of bubbles of nitrogen within the body of a diver. When these bubbles act on various parts of the body, such as the nerves, they have a negative impact and cause a variety of signs and symptoms that signal the diver is suffering from decompression sickness. Def og Solution: A substance rubbed or sprayed on the lens of the mask to keep it free of condensation. Saliva is often used as a defog solution. Dehydration: A lack of adequate body fluids. Density: The mass per unit of volume. Dep th Gauge: An instrument or device that indicates depth. Div e Computer: An electronic device that senses pressure, measures time, continuously calculates the amount of nitrogen in several theoretical body compartments, and displays the information to help divers avoid decompression sickness. Div e Schedule: An abbreviated statement of the depth and duration of a dive expressed as depth/ time. For example, 21 meters (70 feet) for 40 minutes or 21/40 (70/40). Div e Time Calculator: A rotary calculator containing the NAUI Dive Tables in a format that eliminates the mathematical calculations associated with the dive tables. Dra g: The resistance encountered when moving through the water because of the water’s density. Dri ft Diving: A dive made using a current as the primary means of propulsion. Dry Suit: A protective suit that excludes water and prevents it from coming into contact with covered portions of the body. E Ear Drum: The membrane that separates the middle and outer ears. GLOSSARY GLOSSARY
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