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sites. Gradient factors is a method used to control the shape of the decompression profile.

in a consistent manner. There are two parameters GF-Low and GF-High. The first

parameter determines where the initial stop begins. The second parameter determines the

maximal allowing tissue loading upon surfacing. These two points determine the slope

used to modify the “M-values” during the ascent. For each given depth the “M-value” is

lowered based on the computed GF for that depth. For example if the GF settings are

10/95, the diver is allowed to ascend until the tissue loading is 10% of the controlling

compartment, at each sucessive stop depth, the maximal tissue loading is increased based

on the calculated slope until the GF-High is reached on the last stop. GF-High is the

ultimate level of conservatism determing the final surfacing compartment tension. The

lower the value is for GF-Low the deeper the first stop will be. The lower the value is for

GF-High the longer the overal decompresssion will be.

A unique ability of the HammerHead decompression software is allowing the

diver to change conservatism levels while underwater. This has some potential benefits

as well as potential downsides. If the diver plans on using the ability to change

conservatism while underwater , the diver should start with the most conservative setting

expected, and lower the level of conservatism, conditions permitting. Higher levels of

conservatism and/or lower GF-Low will generall result in deeper initial stops. It is not

recommended going from a higher GF-Low value to a lower value while underwater

unless you are still below the expected stop depth of the new setting. Changing to a new

conservatism level with a lower GF-Low might require the diver to descend to the new

required stop depth or stay at current level until offgassing catches up. The alternative is

to program a custom conservatism setting with the same GF-Low setting and a new less

conservative GF-High setting.

The first predefined conservatism setting 10/100 is very aggressive with deep

initial stops with a surfacing compartment gradient equal to Buhlman’s limits. This

setting is primarily designed for fit individuals in good physical fitness. The second

setting 20/95 stages the initial stop shallower but backs off allowable surfacing limits

The third setting is applicable to most divers with light workloads and warm water. The

fourth setting covers most divers with moderate work loads for a wide variety of water

temperatures. The last predefined value is ultra conservative with the lowest allowable

tissue tensions. This setting has the shallowest of the initial stops and longest stop times.

The final setting defaults to 36/71 which is almost identical to setting 5, and just serves to

initialize the variables and should.be redefined to some suitable values. The Hammerhead

enforces that the GF-Low setting must be 5% less than the GF-High value. In practice,

this limitation should force a stop depth one level deeper than the maximal allowable

tissue loading.

Creating and using custom gradient factors should only be undertaken by those

that understand the consequences of these settings. The limits imposed by the “Custom

GF” entry insure that settings should not be less conservative in theory than an

unmodified Buhlman profile. Aggressive settings should not be undertaken lightly, the

risk of decompression sickness is real. It is not recommended diving any computer to the

maximal limits. Conservatism settings 3 and 4 are a good balance of potential risk and

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Dive Rite O2ptima Guía de usuario Pagina 39