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FYI, The following is a list of multipliers and formula, to calculate the theoretical depth in 500' increments. Take 1 divided by the multiplier for your altitude, then multiply that by your planned depth, to give you your theoretical altitude depth. Altitude Multiplier 500 0.892 1,000 0.964 1,500 0.947 2,000 0.930 2,500 0.913 3,000 0.896 3,500 0.880 4,000 0.864 4,500 0.848 5,000 0.832 5,500 0.817 6,000 0.801 6,500 0.786 7,000 0.772 7,500 0.757 8,000 0.743 8,500 0.729 9,000 0.715 9,500 0.701 10,000 0.688 10,500 0.676 11,000 0.662 11,500 0.649 12,000 0.636 Hope this helps. Harrison -----Original Message----- From: Matthias Voss [SMTP:mat.voss@t-*.de*] Sent: Tuesday, July 25, 2000 4:23 AM To: techdiver@aquanaut.com Cc: techdiver@aquanaut.com Subject: Re: Altitude diving question Steve schrieb: > 1) I know how wrong dive tables are, and I've thrown out my USN long ago in ?Steve, in Europe we have Buehlmann tables for altitude diving. > favour of planning my dives using software. Is there some tables were created with software , too. general rule of > thumb I should follow instead of plugging my altitude into the software? Depends on yr software. What it needs -and- should be able to work with, is the ambient barographic pressure at your altitude level. For calculating the stops , you should know about the specific way your depth gauge reacts to diminished barogrophic pressure. Diving at a different barographic pressurre means a change of the relation ambient pressure / surface pressure. In altitude, the lesser surface pressure means a higher ratio, so that any depth changes imply a greater pressure change than at sea level. Same applies to a depth gauge with a sealed chamber/ membrane assembly. If you have a gauge which allows equalization of the behind membrane compartment with ambient pressure, this will give the the right ratios ( not depth) when diving. You need to adjust the zero starting point as well, of course. Equalization means to get the right compliance of the gauges rear chamber . Some computers just do it right. > > ie add 5ft to your depth for every 2000ft above sea level - or something > similar better go for the correct pressure ratios. > 2) I've heard that once arriving to altitude, it is best to spend 12-24 hrs > at that altitude before diving, so your body gets acclimatised. I suspect > that this is crap, but I'd just like to confirm. Your hearsay is right. Climbing means decompression. Any dive following a climb is a second dive ! > > 3) At what height should I start altering my profile. This depends on which height your normal tables/ program is intended for. Standard Buhlmann tables afford a change at 2000 ft. Regards Matthias -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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