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The Vytec uses a modified RGBM algorithm folded over a Haldane model.
From Bruce Wienke's site (www.rgbmdiving.com):

Present notions of nucleation and bubbles suggest that decompression phase separation is random, yet highly probable, in body tissue. Once established, a gaseous phase will further grow by acquiring gas from adjacent saturated tissue, according to the strength of the free-dissolved gradient. Although exchange mechanisms are better understood, nucleation and stabilization mechanisms remain less so, and calculationally elusive. But even with a paucity of knowledge, many feel that existing practices and recent studies on bubbles and nuclei shed considerable light on growth and elimination processes, and time scales. Their consistency with underlying physical principles suggest directions for table and meter modeling, beyond parameter fitting and extrapolation techniques. Recovering dissolved gas algorithms for short exposure times, phase models link to bubble mechanics and critical volume trigger points. The RGBM incorporates all of the above in all implementations, and additionally supports the efficacy of recently suggested safe diving practices, by simple virtue of its dual phase mechanics:
• reduced nonstop time limits;
• safety stops (or shallow swimming ascents) in the 10-20 fsw zone;
• ascent rates not exceeding 30 fsw/min;
• restricted repetitive exposures, particularly beyond 100 fsw,
• restricted reverse profile and deep spike diving;
• restricted multiday activity;
• smooth coalescence of bounce and saturation limit points;
• consistent diving protocols for altitude;
• deep stops for decompression, extended range, and mixed gas diving with overall shorter de compression times, particularly for the shallow zone;
• use of helium rich mixtures for technical diving, with shallower isobaric switches to nitrox than suggested by Haldane stategies;
• use of pure oxygen in the shallow zone to eliminate both dissolved and bubble inert gases.

I've just noticed that the GAP decompression software (www.gap-software.com) has been released using RGBM - anyone tried it yet?

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