Computer?

[DevonDiver]

Interesting presentation by Bruce Weinke shows adding deep stops in this manner may not have the benefit we think it does.

Yes, indeed. Which is why for tech dives, I add them mentally, rather than pay extra for a computer that can calculate them.

Doing them mentally, means you have the best of both worlds. You get the possible benefit of the DS, plus you computer doesn't recognise them.... so you won't be credited for them on your deco either.

 

[Doppler]

The deep stop is simply the mid-point between bottom depth and the first 'mandatory' stop.

Not really... at least not on a dive where staged stops are called for, and certainly not on a dive where ascent behavior is informed by a dual-phase algorithm.

Running stops (deep stops or whatever you want to call them) MUST begin above the off-gassing ceiling; how far above is a matter of debate, with the common variance between a little less than one metre to as much as nine or ten metres.

Throwing out an arbitrary definition without qualifying it is counter-productive and does nothing but muddy waters already cloudy from a mass of collective bull****.

The off-gassing ceiling is a function of average or maximum depth, gas used, and dive duration. There are several methods to calculate its location on the fly but I do not believe the method you suggest is the best one outside of a situation where divers are using old-school, bend-'em-and-mend-'em schedules as their baseline.

 

[DevonDiver]

Hi Steve,

I was giving a simplistic answer to, as an aside point, to a comment made by the OP about deep stops on a computer. The depth of this answer was based on the OP's current level of experience:

Dive Classification
New To Diving
Years Certified
Less Than One Year

If I call them 'Pyle Stops', will you be less offended?

That was Pyle's stated method for calculating deep stops.... and, yes, the theory has moved on from that level considerably... but in this thread, I wasn't aiming to start a cutting edge deco algorythm debate...
​

 

[ianr33]

The Tusa dc hunter is only $220 so I thought it was pretty cheap for what it does. And it could be used a bottom timer in gauge mode right?
I checked the manual and bugman is right it does have the ability to switch gases.

It doesn't have a deep stop function though. I'm not sure how important that is either. I see a lot of other computers have it though.

Yes you can use it in gauge mode,but why bother? My normal approach to cave dives is to follow the computer (Shearwater Predator) and carry a bottom timer and tables for a worst case scenario.
Maybe I'm slow and lazy but I find that easier than mentally calculating deco in a cave that has a lot of ups and downs.Opinions vary on this.

Adding deepstops is easy if you use the manual override. If you are doing NDL dives they are optional anyway. In many caves you will do deepstops as you follow the profile of the cave back out.

Dont know about Australian caves,but in Florida many,many dives are done with 32% and O2 for deco. The Tusa/ Diverite Duo works very well on these dives.

 

[MarineResearch]

Hi everybody,

I'm looking to buy my first dc and want something that will take me through to entry level cave diving.

I have the Tusa dc hunter in mind but it doesn't have the ability to switch gases underwater. Is this an important feature?

You might consider a computer with an OLED display to simplify reading your computer in the dark. Dive lights tend to overwhelm the displays on some computers, and it's not always convenient to push the light button on your computer.

 

[Doppler]

Hi Steve,

I was giving a simplistic answer to, as an aside point, to a comment made by the OP about deep stops on a computer. The depth of this answer was based on the OP's current level of experience:

If I call them 'Pyle Stops', will you be less offended?

That was Pyle's stated method for calculating deep stops.... and, yes, the theory has moved on from that level considerably... but in this thread, I wasn't aiming to start a cutting edge deco algorythm debate...
​

:cool2: Not offended, Andy. Just believe we may as well start everyone off with the best possible information available. With all due respects to Richard, that was then and this is now!