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Oxygen Accumulation Bar Graph (O2BG)
Variable Ascent Rate Indicator (VARI)
WARNING: At depths greater than 60 FT (18 M),
ascent rates should not exceed 60 feet per minute
(18 meters per minute). At depths of 60 FT (18 M)
and shallower, ascent rates should not exceed 30
feet per minute (9 meters per minute).
Fig. 2 - O2BG and VARI
VARI
Deeper than 60 FT (18 M)
Segments Ascent Rate =
Displayed FPM MPM
0 0-20 0 - 6
1 21-50 6.5-15
2 51-60 15.5-18
3 >60 >18
60 FT (18 M) & Shallower
Segments Ascent Rate =
Displayed FPM MPM
0 0-10 0 - 3
1 11-25 3.5-7.5
2 26-30 8-9
3>30>9
a
b