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All >If one were going to use trimix in the deep rec/lite tec range, as many >have been advocating here, for moderate exposures, , say, 100-160', 20-40 >minute bottom, and wanted to have a fairly standard mix to use rather than >doing a different mix for every dive, what would one use? As a slight digression, it is worth developing standard mixes and tables for ranges of depths and times. I dive mixes for every 10 m, i.e. I use 50, 60, 70, 80 metre mixes together with the corresponding tables... My run times are also in 5 minute increments (easy to remember) - usually 3 options with the middle run time being the planned run time. This RT is usually set at around 90 minutes due to the water temperature in the UK. My tables for my 80m mix (16/44) go in 5 metre increments i.e. 80, 75, 70, 65, 60, 55, 50. Thus if we mix for an 80 metre dive and weather precludes diving this wreck, and we have to do a 63m wreck, then I would simply dive my 65 m tables for this gas. For multiple day diving, I see a penalty of around 4 minutes maximum. I use the same tables but add in a minute here and there (one minute 3 m deeper than my first mandatory stop, 1 minute in the middle somewhere and 2 minutes on my last stop at 6 m. This is in addition to 10 m/minute ascents and deep stops added. My tables are laminated and therefore re-usable. David Shimell Project Manager, Sequent Computer Systems Ltd., Sandton, South Africa. Email: shimell@se*.co* <mailto:shimell@se*.co*> -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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