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The advantages of referral are that the learner diver can complete the theory and confined water training near home, which should be more economical in time and cost, and there is a longer time available for learning the information, with less time pressure and vacation activity distraction, [7] then get the open water training in a vacation environment, where the water conditions are likely ...
Nav finder and underwater compass – basic underwater navigation tools Suunto SK-7 diving compass in aftermarket wrist mount with bungee straps. Diver navigation, termed "underwater navigation" by scuba divers, [1] is a set of techniques—including observing natural features, the use of a compass, and surface observations—that divers use to navigate underwater.
The combination of distance and direction fixes the position of the tracked target relative to the surface vessel. Additional sensors including GPS, a gyro or electronic compass and a vertical reference unit are then used to compensate for the changing position and orientation (pitch, roll, bearing) of the surface vessel and its transducer pole.
The equipment used for recreational diving is mostly open circuit scuba, though semi closed and fully automated electronic closed circuit rebreathers may be included in the scope of recreational diving. Risk is managed by training the diver in a range of standardised procedures and skills appropriate to the equipment the diver chooses to use ...
The profile of a dive is the variation of depth, measured as ambient pressure, over time during that dive. The actual location of the diver at any time is generally not considered, as the dive profile is a tool for dive planning and decompression status calculation.
Scuba has limitations of breathing gas supply, communications between diver and surface are problematic, the location of the diver may be difficult to monitor, and it is considered a higher-risk mode of diving in most circumstances. Scuba is specifically forbidden for some professional applications.
The Professional Diving Instructors Corporation (PDIC) is an international SCUBA training and certification agency. It has an estimated 5 million active recreational divers. [2] Founded in 1969, PDIC was established out of the need to properly train SCUBA instructors. [1]
Vertical position relative to the surface, also known as depth measurement, may use: Depth gauges (using pressure as a proxy) Dive computers (using pressure as a proxy) Measuring tapes (direct linear measurement) Pneumofathometers (using pressure as a proxy) Length measurement in other directions, using: Measuring tape, Surveyor's chain,