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A CMAS dive log book.. A dive log is a record of the diving history of an underwater diver.The log may either be in a book, locally hosted software, or web based.The log serves purposes both related to safety and personal records.
In scuba diving, the dive log documents the experience of a diver by logging a diver's dives. In the fishing industry, a logbook is used to record catch data as part of the fisheries regulations. It is then submitted to the fishing authorities of the vessel's flag state. [citation needed]
Dive profile of an actual dive as recorded by a personal dive computer and displayed on a desktop screen using dive logging software. In this case depth is in metres. Personal dive computer display of dive profile and log data. A dive profile is a description of a diver's pressure exposure over
Specialised techniques and equipment have been developed for various types of aquatic environments and target fish. Spearfishing may be done using free-diving, snorkelling or scuba diving techniques. [55] Abalone, lobster, sea urchins and various other marine invertebrates can be collected by hand or with the assistance of hand tools while diving.
The history of scuba diving is closely linked with the history of scuba equipment.By the turn of the twentieth century, two basic architectures for underwater breathing apparatus had been pioneered; open-circuit surface supplied equipment where the diver's exhaled gas is vented directly into the water, and closed-circuit breathing apparatus where the diver's carbon dioxide is filtered from ...
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Attaching buoys is one of the main processes by which underwater logs are salvaged from the bottom of lakes and rivers. First, a scuba-diver must locate the sunken logs in the water, searching from about three feet from the bottom of the lake or river. Then, a buoy is placed around the log about three feet from its back.
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. Two styles of flag are in use. Internationally, the code flag alfa/alpha, which is white and blue, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed.
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