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What do people know about the DCIEM mixed gas tables? How do they differ in operational details from the Consortium tables? My understanding of the Consortium tables is that they are set up for any bottom mix (which for Scuba type bottom times approximates to assuming the worst case, a Heliox bottom mix), with Nitrox 50/50 starting at 70 feet and O2 at 20 feet, with air breaks. The only repetitive dive allowed is one, with a three hour surface interval. I do not have access to the tables - I cannot afford the $1,000. I have heard that the U.S. Navy is adopting the DCIEM tables for mixed gases. Before I plop down money for them, I would like to know what gases are used, and what are the other operational parameters. My main problem with the inwater O2 schedules of the air tables is that they have the O2 stop at 30 feet (2.0 ATA), which strikes me as a little too deep. Their fix is to do the air stop for 30 feet, accept no credit, and run the full O2 stop at 20 feet. This is safe, but loses the operational simplicity of the short tables. I would also like to know what bottom mix, and travel mixes, they use. "Poor man's trimix", i.e. mixes of helium and air, are *MUCH* easier to mix and analyze, and is attractive as a bottom mix. Safe Diving Wrolf
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