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No Decompression Status—
You can help remain within the
No-Decompression Limits (NDLs) by monitoring both the
remaining No-Decompression Limit displayed on the right-
hand side of the screen and the Residual Nitrogen Bar
Graph on the left. Bear in mind that the remaining No-
Decompression Limit may decrease rapidly if you descend
to deeper depths.
A good way to help ensure that you remain well within
the No-Decompression Limits is to make certain that the
Residual Nitrogen Bar Graph does not enter its Caution Zone
(i.e., displays more than six pixels). If you do find yourself
entering this Caution Zone, you should immediately either:
ascend to a substantially shallower depth; or, ascend to safety
stop depth, make a normal safety stop, then surface and end
the dive.
Ascent Rate Warning—
The IQ-600’s algorithm (the formula it
works to determine your nitrogen uptake and release) assumes
you keep your rate of ascent within the following limits:
Depth Range Ascent Rate
0 ft/0m to 20 ft/5.9m 26 ft/8m per Minute
20 ft/6.0m to 59 ft/17.9m 39 ft/12m per Minute
59 ft/18.0m or deeper 52 ft/16m per Minute
Figure 10: Ascent Rate Warning.
