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32
decompression limit, the TLBG will diminish as control shifts to slower
compartments. This is a feature of the decompression model that is the
basis for multilevel diving, one of the most important advantages the
DataPlus offers. (See page 80 in the Reference section for more informa-
tion pertaining to tissue tracking.)
The no decompression algorithm is based upon Haldane’s theory using
maximum allowable nitrogen levels developed by Merrill Spencer. Repeti-
tive diving control is based upon experiments designed and conducted by
Dr. Ray Rogers and Dr. Michael Powell in 1987. Diving Science and
Technology
®
(DSAT), a corporate affiliate of PADI
®
, commissioned these
experiments and now uses the findings in the Recreational Dive Planner
distributed by PADI.
As your depth and bottom time increase, the TLBG will fill with segments in a
clockwise direction from the lower left toward the upper left to represent the
absorption of nitrogen. If the TLBG passes the yellow caution (C.Z.) zone (Fig.
38a), you will have exceeded the No Decompression Limit and the DataPlus will
enter Decompression Mode. Upon ascent to shallower depths, the bar graph will
begin to recede in a counter clockwise direction, indicating that additional no
decompression time is available through multilevel diving. In the event that
this occurs, you must serve your decompression obligation as required,
then further reduce the TLBG with a safety stop.
Fig. 38 - TLBG Caution Zone
FT
O2
FT
MAX
G
LO
DATA
PLUS
a
42


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