VR Technology Limited
VGM incorporates 5 main features:
1. Bühlmann decompression model
2. Modification of tissue over pressure tolerances or M values for the faster
tissues to create a decompression profile similar to a bubble model like VPM
3. Further modification of over pressure tolerances for deep or long exposure
dives, especially in the fast and middle order tissues
4. Automatic adjustment of the above parameters to allow the default settings to
give common decompression and No Stop times across the range of diving
from 10m to 120m
5. User adjustable parameters so the diver can use his/her experience to further
modify the decompression to that which suits him/her. The Equivalent
Gradient Factors are displayed for a particular dive for ease of comparison
with other dive computers and dive tables, although because this system goes
beyond Gradient Factors certain adjustments may only give an estimate of the
nearest GF equivalent.
A basic version of VGM PC dive planning software VGM ProPlanner is available free
from the web site. This allows a quick way to see what decompression the VRx dive
computer will give and allow specific conservatism factors to be tried out on the PC
before then choosing the right ones for a dive using the VRx. The PC software also
gives print outs and an output in common spreadsheet style format for use in creating
back-up tables.
VR Dive Computer Operations Manual 2009 rev E 28/01/2009
75
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