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Dive Computers and Time-to-Fly
Time-to-fly is the time you must wait between your last dive and ascending to altitude. Most dive computers display the amount of time remaining until residual nitrogen levels drop to the point where the computer considers a subsequent dive to be the same as a non-repetitive dive. This time may be described as a time-to-fly. However, even after considerable study, flying after diving recommendations remain controversial and continue to evolve. Decompression sickness statistics from Divers Alert Network (DAN) make it very clear that no current decompression theory and computer algorithm is able to account for all the complexities of decompression introduced by flying after diving. Instead, Dive Rite Express strongly encourages you to follow the May 2002 Flying After Diving Workshop recommendations published by DAN:

For a single no-stop-required dive, a minimum preflight surface interval of 12 hours is suggested.

For multiple dives in a single day, or multiple days of diving, a minimum preflight surface interval of 18 hours is suggested.

Wait substantially longer (i.e., 24 to 36 hours) if you have done any decompression-stop-required diving.

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Dive Computers and Time-to-Fly