A person on the beach who records when divers enter and exit the water. Typically used during scuba classes to keep track of the students, watch the gear, provide assistance when required.
Bounce dive
Specifically, to recreationally oriented divers, bounce dives usually means going straight down and coming straight back up, without stops, in a pattern resembling a spike, in order to retrieve items or due to poor buoyancy control.
a diving disorder caused by bubbles of inert gases, such as nitrogen or helium, becoming trapped in the tissues, organs and blood vessels of the body causing symptoms ranging from rashes to death.
Printed tables that provide divers with a way of avoiding Decompression Sickness by giving the maximum times that can be spent at depth, and by indicating the Decompression Stops and Surface Intervals needed for a particular depth and time profile to be carried out safely.
a small buoy on a line that divers inflate underwater to indicate their location to their boat.
Dive club
a group of people with an interest in SCUBA diving.
Dive Flag
Flag used by a boat to indicate that it has 'divers down'. Comes in two versions: the international marine (international code letter flag 'A', ) and the red and white flag (red with white diagonal, ), introduced by Ted Nixon in 1956. Boats must maintain a minimum safety distance away from the flag. Personal water craft pose a hazard to divers, and sadly few operators do know what a dive flag is. Some believe it is a turn marker. If you observe a personal water craft operating to close to a dive flag contact the lake patrol.
Dive Shop
supplier of dive equipment or training, or organizer of dive expeditions.
An urban legend about a diver who is scooped up by a plane/chopper and dropped on a forest fire led someone to build a web site for the fictitious sport of Firediving (http://www.firediving.com/).
a decompression regime used in commercial diving that allows divers to live work for weeks at a time where their tissues become saturated in high pressure gas.
Sawtooth profile
the shape of the depth v. time graph of a "yo-yo dive."
Typical for inexperienced divers, yo-yo dives mean alternating periods of descent and ascent in a sawtooth pattern, usually due to poor buoyancy control, resembling the yo-yo toy movement.
Diving masks and diving helmets solve this problem by creating an air partition between the diver's eyes and the water.
Diving suits, mostly being made of compressible materials, reduce in volume as the diver descends and expand as the diver ascends creating unwanted buoyancy changes.
As the concentration of gases increases with the depth of the dive, and some gases are toxic at high concentrations, the design of breathing gas mixes depends on the depth of the dive.
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