Ratio deco #1

[gorcio]

Totally waiting for someone to come out with a timer that has:
Average Depth (resettable), Current Depth, Run Time (minutes & seconds) and a resettable stop watch function that shows not only minutes but also seconds.

It's already on the market, but it is a computer, not a bottom timer. It is OSTC Mk2 by HeinrichsWeikamp.

 

[rjack321]

Average Depth (resettable), Current Depth, Run Time (minutes & seconds) and a resettable stop watch function that shows not only minutes but also seconds.

Why this passion for seconds? About all they are good for is learning a proper ascent rate. Once you actually know what one is its superfluous.

 

[Pacific-Explorers]

Why this passion for seconds? About all they are good for is learning a proper ascent rate. Once you actually know what one is its superfluous.

Just preference, like seeing the seconds counting up.

 

[Pacific-Explorers]

Had a look at a Tec 2g yesterday, nice little computer. And in guage mode does everything I want. Will be a nice backup to my VR3 and the stop watch for deco will work great (yup, its in seconds too so theres no more rounding up to the next minute on each stop

 

[flots am]

Yup I said it... (I imagine that may raise an eyebrow or two).
Now is there going to be any computer companies out there to support it?

It's unlikely that any manufacturer will specifically support a decompression calculation method that only works under limited conditions and with such a small group of potential customers.

Ratio deco is better than nothing if you screwed up and blew your plan and need some way to get back to the surface without killing yourself, but I'll take a vPlanner plan and not blowing the dive, over on-the-fly in-my-head any day of the week.

flots.

 

[Blackwood]

It's unlikely that any manufacturer will specifically support a decompression calculation method that only works under limited conditions and with such a small group of potential customers.

+1. It simply wouldn't be worth the investment or liability.

LOL, yes quite true... let me reword that, I guess more along the lines of electronic wet notes that you could adjust where you would like to spit up your deco time with the standard mixes built in etc.

Excel works pretty well. I've written a number of deco excel sheets (ratio deco 1:1, ratio deco 2:1, time-over MDL). I do, however, plan dives that are outside of my wheelhouse by hand.

FWIW, I can 'spit out deco time' doing the math in my head faster than I could likely input things into electronic wetnotes (or whatever), it's really that trivial. Multiply by a whole number, add or subtract even intervals of 5.

 

[rjack321]

Had a look at a Tec 2g yesterday, nice little computer. And in guage mode does everything I want. Will be a nice backup to my VR3 and the stop watch for deco will work great (yup, its in seconds too so theres no more rounding up to the next minute on each stop

What is the VR3 for? Its not going to match with RD that's for sure.

 

[TSandM]

Ratio deco is better than nothing if you screwed up and blew your plan and need some way to get back to the surface without killing yourself, but I'll take a vPlanner plan and not blowing the dive, over on-the-fly in-my-head any day of the week.

I haven't done a lot of staged decompression dives, but I plan them and execute them with RD. I have a Liquivision which has V-planner on it, and I let it run but mostly pay no attention to the output (easy to do with the way the LV screen is organized) but I do look at the output from the program when I log my dives. RD matches VPM on +3 almost precisely -- perhaps not in the actual depth and time of the stops, but in the total decompression. I have yet to leave the water with the X1 unsatisfied (so long as I can actually get the dratted thing to gas switch ).

 

[rjack321]

but I'll take a vPlanner plan and not blowing the dive, over on-the-fly in-my-head any day of the week.

To each his own but we've changed from 2 deco gas to 1 deco gas plans, trimmed 40ft off our max depth, added 30ft to depth, added 15mins to bottom time, and a host of other things on the fly with RD. More variations than you've got wet notes pages for printed plans. Cause exploration dives are never quite like you thought they'd be.

 

[rongoodman]

There are computers available now which can run straight Buhlmann GF, such as the Liquivision or Shearwater. The proper choice of gradient factors(30/85 sticks in my mind) should bring you close to what you would get from Ratio Deco.