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outs and an output in common spreadsheet style format for use in creating back-up
tables.
The VRx gives an Equivalent Gradient Factor (EGF) after a dive. Because it is an
adaptive variable system, the gradient factor cannot be calculated until after
decompression has started. The expected EGF is displayed in the dive summary
screen accessed by using a long press of the right button from the main dive screen. It
is the screen displayed after running through the decompression stop look ahead. The
EGF is also shown on the DivePlan exit screen and the dive log in the VRx.
Summary
VGM is able to adapt to the dive actually dived – the gradient factor is essentially
adjusted on a dive by dive basis automatically. The safety factors can be adjusted
from the default settings to adapt a decompression to the required profile based on the
diver’s experience though.
WARNING!
Even if your dive computer or PC generated software allows for less
conservatism and a reduction in decompression times this should not
be arbitrarily undertaken without first researching data available from
other divers/agencies, conducting controlled trials and understanding
that you may be undertaking a level of experimentation in order to adjust
the algorithm for your specific needs.
No decompression algorithms can give a guaranteed safe
decompression. It is your responsibility to be trained, dive safely, carry
backup tables and instrumentation and compare any decompression
profiles generated by the VR range of computers and their associated
decompression software against established diving tables with which
you are happy and/or accept that you may be conducting experimental
decompressions.
VR Dive Computer Operations Manual 2009 rev E 28/01/2009
36
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