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Gas Analysis
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A procedure whereby the fractions of gas in a breathing mixture are determined. Generally it is used to determine the fraction of oxygen to within 1 %, to control the effects of Oxygen toxicity. Most diving operations will analyse for oxygen only. In more complex Trimix's, it is be desirable to analyse for the inert gases as well.
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Gas Laws
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Laws that predict how gases will behave with changes in pressure, temperature and volume.
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Gas Saturation
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Gas saturation occurs when the level of dissolved gas in a particular body tissue has reached its maximum.
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Gauge pressure
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Pressure exclusive of atmospheric pressure, when diving, gauge pressure is due to the water pressure.
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Giant Stride Entry
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The most common method of entering water from a boat transom, pier, etc., where the standing diver takes a large step into the water while securely holding mask, tucking chin and bringing fins quickly together to keep himself at the surface for a controlled descent.
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GPS
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global positioning system. A worldwide system of navigation based on a ring of stationary satellites. Small, even handheld, GPS devices can be used to accurately determine speed and direction of travel, and pinpoint dive site locations.
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Granny Line
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Also known as a Gerry Line. A line which goes from the stern platform or hang bar to the anchor line.
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