OxygenAccumulationBarGraph(O2BG)

The O2 Bar Graph (Fig. 3a) represents oxygen loading, showing the maximum of either per dive accumulated oxygen, or 24 hour period accumulated oxygen.

As your oxygen exposure (accumulation) increases during the dive, segments will add to the Bar Graph, and as loading decreases, it will begin to recede, indicating that additional exposure is allowed for that dive and 24 hour period.

VariableAscentRateIndicator(VARI)

The Variable Ascent Rate Indicator (Fig. 3b) provides a visual representation of ascent speed (i.e., an ascent speedometer). Green is a 'normal' rate, yellow a 'caution' rate, and red is 'Too Fast'. The segments of the VARI represent two sets of speeds which change at a reference depth of 60 feet (18 meters). Refer to the chart (Fig. 4) for segment values.

 

 

 

 

 

 

 

 

 

 

Deeper than 60 feet (18 m)

60 feet (18 m) & Shallower

N2

DECO

 

 

b

 

 

 

 

Segments

Ascent Rate =

Segments

Ascent Rate =

 

 

 

 

 

 

 

 

 

Displayed

FPM

MPM

Displayed

FPM

MPM

 

 

 

 

 

 

 

 

TOO

 

0

0-20 0 - 6

0

0-10

0 - 3

 

 

 

 

 

 

 

 

 

FAST

 

1

21-30 6.5-9

1

11-15 3.5-4.5

 

 

 

 

 

 

 

 

 

 

 

2

31-40 9.5-12

2

16-20

5-6

 

 

 

 

 

 

 

 

 

 

 

3

41-50 12.5-15

3

21-25 6.5-7.5

 

 

 

 

 

 

 

 

 

 

 

4

51-60 15.5-18

4

26-30 8-9

 

 

 

 

 

 

 

 

 

 

 

5

>60

>18

5

>30

>9

 

 

 

 

 

 

a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig.4-VARIValues

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O2

O2

 

 

 

 

 

 

 

 

WARNING: At depths greater than 60 feet (18

 

0

5

10

20

30

40

50

60

 

meters), ascent rates should not exceed 60 fpm (18

 

ATR

 

 

 

 

 

 

 

mpm). At depths of 60 feet (18 meters) and shallower,

 

Fig. 3 - O2BG and VARI

ascent rates should not exceed 30 fpm (9 mpm).

10