VR Technology Limited
ALG – if you have purchased the optional VGM algorithm (VRx only), a short push
of either the right-hand + or left-hand – switch when VGM is highlighted will toggle
between VGM and BUH (Buhlmann).
When BUH is selected decompression will be calculated using our standard modified
Buhlmann ZHL 16 algorithm with 2 minute deep stops.
When VGM selected your VRX will calculate decompression using a VGM-based
algorithm developed by us.
Automatic tissue tolerance adjustments
To allow the VR to give realistic decompression and no stop times across the 10m to
120m range the VGM algorithm automatically modifies tissue tolerances in line with
accepted decompression schedules based on stochastic data.
Tissue over pressure tolerances (M values) begin to be modified from standard VR
Buhlmann settings above 30m bottom depth and 30min bottom time.
User adjustments
Extra changes to the default values can be achieved using the Fast, Mid and Slow
tissue tolerance percentages. Positive percentages give more stop time. Negative
percentages reduce stop times.
A warning screen is displayed when exiting this screen if negative values are set:
Choosing the YES option confirms you are happy with the increased decompression
sickness risk. Choosing the NO option will reset the tissue conservatism to the default
values and take you back to the adjustment screen.
Divers can change conservatism up or down, based on their own knowledge of what
suits their body chemistry and physical ailments or attributes. The Normal or Default
value is 0%. Negative percentage is less safe. Positive percentage is more safe. The
Bar Graph of tissue over-pressure tolerance compares the current values to the
standard default settings. The bar graph transitions from Fast tissues to the left
(mainly relevant to deep stops) through to Slow tissues to the right (mainly relevant to
shallow stops). Mid range tissues are in the middle.
VR Dive Computer Operations Manual 2009 rev E 28/01/2009
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