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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.
A logbook (or log book) is a record used to record states, events, or conditions applicable to complex machines or the personnel who operate them. Logbooks are commonly associated with the operation of aircraft, nuclear plants, particle accelerators, and ships (among other applications).
Personal dive computer display of dive profile and log data A dive profile is a description of a diver's pressure exposure over time. It may be as simple as just a depth and time pair, as in: "sixty for twenty," (a bottom time of 20 minutes at a depth of 60 feet) or as complex as a second by second graphical representation of depth and time ...
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Exley was the first in the world to log over 1,000 cave dives (at the age of 23); in 29 years of cave diving, he made over 4000 dives. [10]Exley had an unusual resistance to nitrogen narcosis, and was one of the few divers to survive a 400-foot (120 m) open-water dive on simple compressed air.
The current no-limit world record holder is Herbert Nitsch with a depth of 214 metres (702 ft) set on 9 June 2007, in Spetses, Greece, [6] however, in a subsequent dive on 6 June 2012 in Santorini, Greece to break his own record, he went down to 253.2 metres (831 ft) and suffered severe decompression sickness immediately afterwards [7] and subsequently retired from competitive events.
In August 2015, Garman tried to set a record for a recreational scuba dive of 1,200 feet (370 m). [6] His wife and son were present at the dive site. The dive took place off the Saint Croix coast. Garman had arranged for a 1,300 feet (400 m) weighted line to be anchored in place as part of the dive.
As of 1990, ascent rates used in tables and dive computers ranged from constant ascent rates of 33, 40, and 60 fpm, from all depths, to variable depth dependent rates of 60 fpm for depths below 100 ft, 40 fpm for depths between 100 and 60 ft, and 20 fpm for depths less than 60 ft in the ORCA dive computers.