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Ascent Rate Indicator (ARI)
The Ascent Rate Indicator located along the bottom of the screen (Fig. 3a) is provided to help
you avoid excessive ascent rates by providing a visual representation of ascent speed, rather than
just showing that you are ascending too fast.
The ARI displays up to 3 segments that may be considered an ascent rate speedometer. Green is
a 'normal' rate, yellow a 'caution' rate, and red is 'Too Fast'. The segments of the Ascent Rate In-
dicator represent 2 sets of speeds which change at a reference depth of 60 feet (18 meters). Refer
to the chart at the right for segment values.
When your Ascent Rate exceeds the maximum recommended rate of 60 feet (18 meters) per
minute when deeper than 60 feet (18 meters) or 30 feet (9 meters) per minute when shallower
than 60 feet (18 meters), the bar graph segments will enter the red 'Too Fast' zone at which time
all 5 segments will flash once per second until your ascent speed is slowed.
Nitrogen Bar Graph (NiBG)
The Nitrogen Bar Graph (Fig. 3b) represents tissue loading of nitrogen, showing your relative no
decompression or decompression status. As your depth and elapsed dive time increase, segments
will add to the bar graph, and as you ascend to shallower depths, the bar graph will begin to re-
cede, indicating that additional no decompression time is allowed for multilevel diving.
The Nitrogen Bar Graph also warns you that you have entered Decompression Mode by filling
the red Deco segment. Decompression is described in more detail in the Special Situations sec-
tion of this manual.
Fig. 3 - Bar Graphs
b
Ascent Rate Indicator
Deeper than 60 feet (18 m)
Segments Ascent Rate =
Displayed FPM MPM
0 0-20 0 - 6
1 21-40 6.5-12
2 41-60 12.5-18
3 >60 >18
60 feet (18 m) & Shallower
Segments Ascent Rate =
Displayed FPM MPM
0 0-10 0 - 3
1 11-20 3.5-6
2 21-30 6.5-9
3 >30 >9
a
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