20
Variable Ascent Rate Indicator
™
- VARI
The Variable Ascent Rate Indicator (VARI) occupies the bottom portion
of the DataMax Sport display (Fig. 17b). The purpose of the VARI is to assist
the diver in preventing too rapid an ascent by providing a visual indication of
ascent speed. The bar graph is made up of six triangular segments and is
analogous to an ascent rate speedometer. There are various speed “zones”
that are color–coded green, yellow, and red. The actual speeds that the VARI
segments represent are listed on page 54. Flashing VARI segments alert the
diver of an ascent rate that has exceeded 60 feet per minute (red VARI zone).
The Variable Ascent Rate Indicator holds U.S. Patent No. 5,156,055.
DIVE TIME REMAINING DISPLAY
One of the most important pieces of information on the DataMax Sport is
the NDC Time Remaining display (Fig. 18). To display Dive Time Remaining
the DataMax Sport constantly monitors theoretical loading of twelve differ-
ent tissue compartments. No-decompression Time is calculated based on the
amount of nitrogen absorbed by these hypothetical compartments
. The rates
at which each of these compartments absorb and release nitrogen is math-
ematically modeled and compared against a maximum allowable nitrogen
level. Whichever one of the twelve is closest to this maximum level, known as
the no-decompression limit, will be considered the controlling compartment
for that depth. Its resulting value will be displayed in the No decompression
Time Remaining display and the Tissue Loading Bar Graph.
The no-decompression algorithm is based upon Haldane’s theory using
Fig. 18 – No-decompression
Dive Time Remaining
FT
NDC
NDC
DataMax
SPORT
®
®
Summary of Contents for DataMax Sport
Page 1: ...DataMax Sport owner s guide model DRB...
Page 5: ...THE DATAMAX SPORT IS EASY TO USE...
Page 13: ...DETAILED OPERATIONS GUIDE...
Page 29: ...HANDLING THE EXTREMES...
Page 42: ...38 this page intentionally left blank...
Page 43: ...CARE and MAINTENANCE...
Page 53: ...REFERENCE...
Page 59: ...NOTES...
