Thanks guys.
Cheers for the links Stephen .. its a good start.
While Ratio Decompression is not a complete decompression model, its most resemble those of Bühlmann algorithm, and the Varying Permeability Model algorithm, with emphasis on the use of deep stops and gradient factors.
- what algorithm does the Vision use?
Before I splash out $150 on Decoplanner to evaluate the differences - can anybody recommend the pro's and cons when comparing it to v-planner?
ADMIN - Do we have a symbol for

DIR.

In any case whatever algorithm you use you need to be able to dive to it.
My "physiological indictors" would be how bad in need of a pee I am. Looking forward to hearing about the others

See ye at the end of the month for more "spidge tales".
Dec