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ronbeau
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Assuming you are not a 
I would suggest you do the work yourself...
I would suggest you do the work yourself...
vladimir
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Telling your instructor you don't have a clue would serve the dual function of letting him know his explanation was perhaps deficient and getting you as complete an explanation as you require. Maybe ScubaToys' Table Tutor might help: http://www.scubatoys.com/store/detail.asp?PRODUCT_ID=TableTutor
As a new diver myself I can feel your frustration in that question. 
I agree with the post that suggested you talk to your instructor about the difficulty you are having. If you don't get satisfactory help, find another instructor who is more helpful.
Almost all of us learning to dive get stuck on one skill or another. Scubaboard is a great place to get help and support and find out tons of useful info, tips, and tricks. I would suggest you read the forum "New Divers and Those Considering Diving". People who post on that board are sympathetic and encouraging. Good luck and don't give up!
I agree with the post that suggested you talk to your instructor about the difficulty you are having. If you don't get satisfactory help, find another instructor who is more helpful. Almost all of us learning to dive get stuck on one skill or another. Scubaboard is a great place to get help and support and find out tons of useful info, tips, and tricks. I would suggest you read the forum "New Divers and Those Considering Diving". People who post on that board are sympathetic and encouraging. Good luck and don't give up!
People will definitely attack this post... but my first question is why are you doing tables?
Tables have little use in today's recreational diving. While most agencies still have some affinity for teaching them, these same agencies (and by extention - your local dive shop) will then spend time telling you all about the benefits of dive computers and that you should definitely have a dive computer - and perhaps a back up computer as well. They will teach you tables then sell you a computer.
The reality is very few recreational divers use tables now-a-days... so our Agency - SDI has led the charge into modern times by teaching tables more as a historical reference that has little practical use. You actually are trained on computers and shown how they work - so that when you buy one, you understand it. We teach you about the history of dive tables - where, when and how they were introduced and how computer algorythims are based on them.
No one truly expects you to use a dive table as a recreational diver. In fact, many resorts now require a computer or they won't let you dive with them. They're not going to ask you if you have your tables with you - they're going to ask you if you have a dive computer.
Advanced levels of training usually require table knowledge... however that can be learned in those advanced classes. Some argue that teaching it in open water gives a basis for later advanced training... and I can see their point. This is not however basic math where in elementary school we learn to add then multiply etc... this is something any adult should be able to understand at any time the training is initiated. So the point is kind of moot.
My final word is don't stress over dive tables. Most agencies don't even have them on their tests any longer and those than do typically only have a couple of very easy basic questions. This too goes to prove that the agencies themselves that teach tables have no real expectation you'll use them... for if they did, they'd make the questions a little more challenging on the open water exams to ensure you understand them (the tables.)
Hopefully that all made sense... but if you really have it on for learning the tables... ask your Instructor for help. That's what he/she is being paid for!
Tables have little use in today's recreational diving. While most agencies still have some affinity for teaching them, these same agencies (and by extention - your local dive shop) will then spend time telling you all about the benefits of dive computers and that you should definitely have a dive computer - and perhaps a back up computer as well. They will teach you tables then sell you a computer.
The reality is very few recreational divers use tables now-a-days... so our Agency - SDI has led the charge into modern times by teaching tables more as a historical reference that has little practical use. You actually are trained on computers and shown how they work - so that when you buy one, you understand it. We teach you about the history of dive tables - where, when and how they were introduced and how computer algorythims are based on them.
No one truly expects you to use a dive table as a recreational diver. In fact, many resorts now require a computer or they won't let you dive with them. They're not going to ask you if you have your tables with you - they're going to ask you if you have a dive computer.
Advanced levels of training usually require table knowledge... however that can be learned in those advanced classes. Some argue that teaching it in open water gives a basis for later advanced training... and I can see their point. This is not however basic math where in elementary school we learn to add then multiply etc... this is something any adult should be able to understand at any time the training is initiated. So the point is kind of moot.
My final word is don't stress over dive tables. Most agencies don't even have them on their tests any longer and those than do typically only have a couple of very easy basic questions. This too goes to prove that the agencies themselves that teach tables have no real expectation you'll use them... for if they did, they'd make the questions a little more challenging on the open water exams to ensure you understand them (the tables.)
Hopefully that all made sense... but if you really have it on for learning the tables... ask your Instructor for help. That's what he/she is being paid for!
don Francisco
Contributor
I'm not attacking this post because it makes a few valid points. Few recreational divers rely on dive tables anymore, but that doesn't make them irrelevant. Some familiarity with tables, even when diving with computers makes for safer diving. It's analogous to driving with local knowlwdge and a map, vs simply following the GPS prompts. If the electronic gadget fails, at least you're not totally lost.
To the OP, I agree with others that simply posting the answer won't help you in the long run. You'll also do your instructor and fellow students by asking for help, since you're probably not the only one confused. The only dumb question is the one you're too embarrased to ask.
Finally to avoid blowing you off entirely, here's a bit of help so you can answer your own question. Re-read the first section of the chapter on tables where it discusses rules for rounding, then find the appropiate column and line for depth and time on your table, and follow those down and across respectively until they meet. That's your answer.
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ronbeau
Contributor
My LDS is run my two NAUI course directors.
When my daughter and I were certified they used the regular NAUI tables that are similar to the PADI tables.
My wife got certified about 15 months ago and they have switched to using the RGBM tables. I doesn't get much simpler than that and it provides a good backup mechanism should the dive computer fail and you have no backup computer available.
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