Is a Computer essential kit?

Please register or login

Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

Benefits of registering include

  • Ability to post and comment on topics and discussions.
  • A Free photo gallery to share your dive photos with the world.
  • You can make this box go away

Joining is quick and easy. Log in or Register now!

boulderjohn

Technical Instructor
ScubaBoard Supporter
Scuba Instructor
Divemaster
Messages
29,358
Reaction score
24,886
Location
Boulder, CO
# of dives
1000 - 2499
For decades there have been tables that will let you do these dives. Stops might be involved but they are doable.
Of course! You can do those dives as no decompression stop dives--you just have to do some decompression stops!
 

boulderjohn

Technical Instructor
ScubaBoard Supporter
Scuba Instructor
Divemaster
Messages
29,358
Reaction score
24,886
Location
Boulder, CO
# of dives
1000 - 2499
For nitrox 32 the rule is 130. 100 feet 30min: 90feet 40min: 80 feet 50 min etc . Every minute over the NDL =1 minute deco at 20 feet .
Can you give me an idea about how many times I am going to have to repeat the same question (how do you plan a multi-level dive using tables or the rule of 120) before I quit? You see, I have known you would not have an answer since the first time I asked--I am wondering how long before I decide that the message is clear to everyone else. I suspect it is getting close to that time now.

By the way, what established algorithm calls for 1 minute of deco at 20 feet for every minute over NDL?
 

KenGordon

Contributor
Messages
4,094
Reaction score
2,924
Of course! You can do those dives as no decompression stop dives--you just have to do some decompression stops!
Was a no stop plan part of your straw man? Sorry I wasn’t’ paying enough attention. Perhaps if divers were not being seriously under trained the stops bit would not be a problem for them, especially if they are trivially short.
 

boulderjohn

Technical Instructor
ScubaBoard Supporter
Scuba Instructor
Divemaster
Messages
29,358
Reaction score
24,886
Location
Boulder, CO
# of dives
1000 - 2499
Was a no stop plan part of your straw man? Sorry I wasn’t’ paying enough attention. Perhaps if divers were not being seriously under trained the stops bit would not be a problem for them, especially if they are trivially short.
The origin of the discussion was that he said he could plan multi-level NDL dives easily using tables. He then said he had been planning multi-level NDL dives for 40 years using the rule of 120. He further challenged people to produce a multi-level dive done on a computer that he could not do with tables/rule of 120.

So I answered the challenge, and despite multiple attempts on my part to repeat the question, he has not met it.

Frankly, I think you have a hell of a nerve to come into a thread you haven't read, read a couple of posts, and then attack me by accusing me of creating a straw man argument.
 

dmaziuk

Contributor
Messages
9,318
Reaction score
5,824
Location
Tanoa
When the commie bastards detonate a high altitude nuke and the EMP takes out all the electronics, you'll be singing a different tune then buddy. 😉

This may disappoint
EMP like other EM waves doesn't propagate underwater; all you need to do is dive your computer when it goes off
 

Jonn

ScubaBoard Supporter
ScubaBoard Supporter
Messages
275
Reaction score
271
Location
Alberta
# of dives
200 - 499
Why does OP need a computer?
You’re right, he doesn’t. If you stay shallow and only breath one tank you can just forget about decompression sickness and all that, it’s not a relevant hazard. I do those dives too and I’ll strap on the compy because it’s there but I don’t need it either.

Less convinced that the manual dive tables we used to use are a practical tool for decompression stress management in this Information Age. If you’re doing the sort of dives that need it, in the sort of social and economic context those dives occur in, it’s ‘essential kit’. Your operator and instabuddy won’t put up with those limitations, neither should you.
 

mac64

Contributor
Messages
1,528
Reaction score
1,199
Location
Ireland
# of dives
5000 - ∞
Can you give me an idea about how many times I am going to have to repeat the same question (how do you plan a multi-level dive using tables or the rule of 120) before I quit? You see, I have known you would not have an answer since the first time I asked--I am wondering how long before I decide that the message is clear to everyone else. I suspect it is getting close to that time now.

By the way, what established algorithm calls for 1 minute of deco at 20 feet for every minute over NDL?
1. 96 feet for 48 minutes
roughly 1 hour surface interval

2. 78 feet for 68 minutes
roughly 90 minute surface interval

3. 99 feet for 59 minutes.
Above is the multi level dive you quoted and below is the dive plan I gave you as to how I would dive it, if the answer doesn’t suit you that’s your problem.
95ft for 48 minutes on EAN 40
I hour surface interval
80ft for 68 minutes EAN 40
I hour interval
100ft for 60 minutes EAN 40
Deco 10 minutes at 10 feet
 

mac64

Contributor
Messages
1,528
Reaction score
1,199
Location
Ireland
# of dives
5000 - ∞
You’re right, he doesn’t. If you stay shallow and only breath one tank you can just forget about decompression sickness and all that, it’s not a relevant hazard. I do those dives too and I’ll strap on the compy because it’s there but I don’t need it either.

Less convinced that the manual dive tables we used to use are a practical tool for decompression stress management in this Information Age. If you’re doing the sort of dives that need it, in the sort of social and economic context those dives occur in, it’s ‘essential kit’. Your operator and instabuddy won’t put up with those limitations, neither should you.
If he used EAN 50 at 60 feet he could dive for 3 hours in the morning have dinner and a four hour interval and dive for another 3 hour
 

mac64

Contributor
Messages
1,528
Reaction score
1,199
Location
Ireland
# of dives
5000 - ∞
By the way, what established algorithm calls for 1 minute of deco at 20 feet for every minute over NDL?
It’s a simple way of insuring you complete enough deco, you simply subtract the NDL time from the actual bottom time to give you the deco time, it only works for 30 minutes deco. If you wish to name it after someone be my guest.
 

mac64

Contributor
Messages
1,528
Reaction score
1,199
Location
Ireland
# of dives
5000 - ∞
The origin of the discussion was that he said he could plan multi-level NDL dives easily using tables. He then said he had been planning multi-level NDL dives for 40 years using the rule of 120. He further challenged people to produce a multi-level dive done on a computer that he could not do with tables/rule of 120.
You’re misquoting me, I said any dive can be planned. I said I done multi level dives 40 years ago using 120 rule, no need to plan them. I challenged no one to produce a multi level dive done on a computer, what’s that about?
 
https://www.shearwater.com/products/swift/

Top Bottom