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INSIGHT
Both the UHMS and DAN agree that “There can never be a flying after diving rule that is guaranteed to prevent decompres-
sion sickness completely. Rather, there can be a guideline that represents the best estimate for a conservative . . . surface inter-
val for the vast majority of divers. There will always be an occasional diver whose physiological makeup or special diving cir-
cumstances will result in the bends”.
To reduce the risk of developing decompression sickness after a single no decompression dive, current guidelines suggest wait-
ing 12 hours prior to exposure to atmospheric pressures equivalent to 1,000 feet (330 meters) above sea level, or greater.
When repetitive dives are conducted during the same day, or period of days, it is suggested that the interval be increased to a
minimum of 24 hours. Note that land travel to higher elevations after diving must also be considered as an exposure to altitude.
DIVE TIME REMAINING (DTR)
One of the most important pieces of information on the Insight is the patented DTR numeric display. To numerically display
Dive Time Remaining, the Insight constantly monitors two critical pieces of information; no decompression status and oxygen
accumulation status. The DTR display will indicate the time that is more critical for you at that particular moment (i.e.; which-
ever time is the least amount available of the two).
This unique feature has been granted U.S. Patent No. 4,586,136.
No Decompression DTR
No Deco DTR is the maximum amount of time that you can stay at your present depth before entering a decompression situa-
tion. It is calculated based on the amount of nitrogen absorbed by twelve hypothetical tissue compartments. The rates each of
these compartments absorb and release nitrogen is mathematically modeled and compared against a maximum allowable nitro-
gen level. Whichever one of the twelve is closest to this maximum level is the controlling compartment for that depth. Its re-
sulting value will be displayed numerically and graphically as the N2BG.