32% Dive plan examples by Hand

[SentinelAce]

My instructor wants me to learn how to do dive tables by hand instead of just my computer which makes sense. For example: I have 3 dives. My mix is 33% . (side mount 80s). I have a deco bottle (40cuft) I need to calculate my max bottom time on all 3 dives, SAC, ATA, PO2. The computer just does it for me. I missed a couple classes where we did the math. Any advice on dive planning? I have to draw these up

 

[WillHartNZ]

Which course is this for?

 

[rongoodman]

Not nearly enough information to hazard a guess. Depth, time? What's in the deco bottle? Are you using tables or dive planning software? Which ones? These calculations should have been covered in a basic Nitrox class.

 

[SentinelAce]

This is for Advanced Nitrox. I need to be able to do the dives by hand. Deco is a 40 with 50%. I need to be able to calculate what percentage of gas, cubic feet used, and deco stops.

 

[PfcAJ]

50% as a deco gas for a 32% nitrox dive?

 

[rongoodman]

You still can't begin to calculate gas used, deco stops, OTU, and whatever else until you specify how deep and for how long your dives are.

 

[WillHartNZ]

I think it would be best to ask your instructor to give you a hand. After all you’re paying him to teach you. Have a read through your manual and then ask your instructor to fill in the gaps that the manual can’t fill.

 

[broncobowsher]

No.

Your instructor should be teaching you this. That is what you are paying them for. Not asking the internet to do your homework for you. Some people understand math better and it is easier, others struggle more. YOU have to learn this.

Now if you pencil a dive together and want to reviewed, that is when you should ask here. We can review your homework, but we are not going to do it for you.

 

[The_Aviator_1]

I'm pretty sure your instructor is wanting you to use a set of dive tables and to demonstrate knowledge and understanding of your personal SAC rate, as well as not just the math, but the theory and physics behind decompression and using higher mixes of oxygen for deco. Having a solid understanding of these is absolutely critical before moving on to any technical diving, so that you can safely plan dives, and prepare for contingencies. As such, I don't think you'll find very many people willing to help you shortcut the hard work, as all we would be doing is putting you in danger in the future. As was stated before, if you come up with a plan and need it looked over, I'm sure many people would be glad to double check your work.

 

[KeithG]

I'm pretty sure your instructor is wanting you to use a set of dive tables and to demonstrate knowledge and understanding of your personal SAC rate, as well as not just the math, but the theory and physics behind decompression and using higher mixes of oxygen for deco. Having a solid understanding of these is absolutely critical before moving on to any technical diving, so that you can safely plan dives, and prepare for contingencies. As such, I don't think you'll find very many people willing to help you shortcut the hard work, as all we would be doing is putting you in danger in the future. As was stated before, if you come up with a plan and need it looked over, I'm sure many people would be glad to double check your work.

Are there "deco tables"?

I know nothing about deco diving but fully understand non deco tables. My impression was that computer programs (at least fancy spreadsheets) were routinely used for deco dive planning. Is it normal to teach / use totally manual planning and calculation of deco dives?

My impression is that the added complexity of various gas mixes, depths and deco obligations would make manual calculation very error prone.

Thoughts / opinions? (I am just trying to learn a very little bit about stuff I will never use...)