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A diver getting ready to dive in front of an alpha flag. As a code signal the International maritime signal flag Alpha (or "Alfa", signifying the letter "A") has the meaning of "I have a diver down; keep well clear at slow speed", [1] used to indicate that the vessel has limited maneuverability, and the presence of a diver in the water around the boat.
A delayed surface marker buoy (DSMB), decompression buoy, or deco buoy is an inflatable buoy which can be deployed while the diver is submerged and generally only towards the end of the dive. The buoy marks the diver's position underwater so the dive boat crew can locate the diver even though the diver may have drifted some distance from the ...
A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Internationally, the code flag "alpha", which has a white hoist and blue swallowtail fly, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed. [56]
Diver left behind due to inaccurate check by boat crew. Diver unable to return to unattended boat. Boat crew may use a positive check system to identify that each diver is on board after a dive. Divers may carry a yellow flag or surface marker buoy to attract attention. Divers may carry a personal submersible EPIRB or vhf radio.
There are two versions: the international code letter flag 'Alpha', , and the red flag with white diagonal bar, . dive ladder diver ladder. See: Human factors in diving equipment design#Diver ladders. A ladder suitable for divers dressed for the specific dive to climb up and down between the surface deployment area and the water. Dive Leader
Surface marker buoy to track a group of divers. Drift diving is a type of scuba diving where a diver is transported by water movement caused by the tide, [1] an ocean current or in a river. The choice whether to drift dive depends on the purpose of the dive and whether there is an option.
The length of the distance line used is dependent on the plan for the dive. An open water diver using the distance line only for a surface marker buoy may only need 50 metres (160 feet), whereas a cave diver may use multiple reels of lengths from 25 ft (7.6 m) to 1000+ ft (300 m).
Diving physics, or the physics of underwater diving, is the basic aspects of physics which describe the effects of the underwater environment on the underwater diver and their equipment, and the effects of blending, compressing, and storing breathing gas mixtures, and supplying them for use at ambient pressure.
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