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Remember what a dive computer does: it tracks your theoretical tissue loading (based on a model) using your actual dive profile. This is normally not a problem with simple OW dives since you are doing no-stop non-deco dives. It is possible though to push a model right to the limits and not incur a theoretical deco obligation. This is rather dangerous and doesn't mean you won't get bent. Basic dive computers that do deco include this feature for emergencies only (so they say). You can model this yourself using Abyss. Try planning a dive and then vary some of the physiology factors: weight, fitness, smoker vs. non-smoker, diving experience levels, equipment (drysuit with air as inflation gas, drysuit with argon as inflation gas, etc), and see what you get. Deco should be planned thoroughly in advance of the dive. Otherwise, how do you know if you have the right gas in the right quantities for proper decompression ? How do you know if you have a sufficient gas reserve for your buddy in the event of a problem ? What if the computer expects you to switch to 36% and you only have 28% (I suppose a good computer would let you enter this) ? You could also inadvertently exceed your CNS clock and not know it until it's too late. One alternative is to plan the dive using a tool like Abyss and then generate contingency schedules in case you dive is shorter and/or shallower than you originally planned. Brian ----- Original Message ----- From: <ANDREW_MCALPINE@ba*.ne*> Cc: <techdiver@aquanaut.com> Sent: Sunday, December 12, 1999 5:57 PM Subject: Re[2]: Bootom timer vs multi-gas computer > You might like to look at www.abysmal.com too! The new Explorer > is cheaper, smaller and seems to have a lot more punch. Must be > my Scottish nature <G> > > Ace > > > ______________________________ Reply Separator _________________________________ > Subject: Re: Bootom timer vs multi-gas computer > Author: "Kevin Atkin" <kevatkin@at*.co*.uk*> at INTERNET > Date: 11/12/99 20:00 > > > Manos > Try > http://www.vr3.co.uk/ > > Regards > Kev > > ----- Original Message ----- > From: Manos Manoli <manos@ma*.co*.cy*> > To: <techdiver@aquanaut.com> > Sent: Friday, December 10, 1999 3:32 PM > Subject: Bootom timer vs multi-gas computer > > > > Do you remember when you bought your first air computer how much > > dive time you gained vs your diving tables. ? We are in a similar > > position now. > > It seams that although bottom timers ( along a pre plan computer > > software ) > > work fine with cave divers it simply waisting a lot of dive time on > > dives in > > open sea specially when exploring new areas where depth varies every > > minute. > > > > ( i still cannot figure it out how can you explore the unknown > > with a bottom timer, being most of the time much higher than your max > > depth > > its a rocky multi level rock side here in the Greek Island of > > Cyprus). > > > > Thinking of purchasing a multi-gas underwater computer , i wanna her > > some advice , brand , models from people with experience using them > > > > Rgds Manos Manoli. > > > > > > > > -- > > 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'. > -- > 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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