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The dive computer makes calculations based on the current conditions of your dive. No calculations are done based on assumed future data (i.e. ascent rates). The dive program is on a loop that repeats every second (this could be faster or slower on some computers). Every second, tissue...

When the group does a deco dive do you decide on a plan using the same algorithm or do you let each student follow their own plan using their own algorithm and settings?

Is it monotonic or monotonous?! :)

Well, because of the gravity of the situation it's all relative anyway.

The faster TC's (tissue compartments) are already set for higher m-values throughout the entire dive. Take a look at the m-value tables for Buhlmann ZH-L16 in the paper "Understanding m-values" by Erik C. Baker, P.E.. Included are values for half-time (HT) and slope. Unless you're doing a very...

For any change we make, especially a change made to the models, we have to ask: What benefit do we get out of it. Setting GF's for 16 tissue compartments makes things more complicated and may have unattended consequences for our safety. We already don't know exactly how conservative a dive will...

This is the key answer. Personally, I will not go through any swim through restrictions that are over about 6 ft. unless my buddy(s) are on long hoses and everyone has discussed the hazard pre-dive.

I added the altitude capability to my spreadsheet. You can enter the final destination altitude and the time it takes to get there and it will happily calculate all the tissue compartment pressures, CurGF, SurGF, and more. It adds an altitude segment after the surface interval (air and O2 if...

I think the rule of "don't drive over a 5,000 ft mountain pass" after a dive has to do with the lack of tracking the pressures in your tissues as you ascend the mountain. Whereas, on a dive at 7,000 ft altitude your dive computer is tracking your tissues and will adjust the NDL time accordingly...

Sorry, I wasn't clear. The last few sentences of my post above refer to people at the shore diving under a breaking wave to escape it, NOT scuba divers out at sea.

One more piece of information on waves I found fascinating. There are generally two types of waves: wind-driven and tsunamis. As indicated by the description wind-driven waves build up by the wind. You can always dive under these waves to calmer water below although for very large waves you may...

The current version of my scuba dive excel spreadsheet allows entry of an altitude and all calculations will be based on using that altitude. It also supports two nitrox gasses for accelerated deco and breathing 100% O2 on the surface followed by an air surface interval if needed. Each dive...

The book I read is called "The Power of the Sea" by Bruce Parker a former chief scientist of the National Ocean Service. You can get it from Amazon. Another interesting fact regarding waves the book mentioned is their power. Wave power goes up by the fourth power of the height. For example...

I read in a book about the dangers of storms at sea. The research said that non-breaking waves (swells) can never capsize a boat no matter how large. However, waves that break will always capsize a boat if the wave height is as high or higher than the boat is long. Also mentioned were three...

So, let's keep the conversation focused on the calculation of NDL. I'm currently diving at a depth of 60 ft. I glance at my computer to discover that my NDL is 30 minutes. At that point in time I have three options: (1) I can stay at the current depth, (2) I can go deeper, or (3) I can go...

Yes. However, you must realize that you are applying a human trait to a computer program that cannot do any thinking. The dive program simply processes real-time data based on sensor input, stored dive profile parameters and past data. An assumption implies that there is a possibility of another...

Compare it to another analyzer known to be accurate.

I took the same course a few years ago. The book (copyright 2010) that came with the course was quite good except for the section on decompression theory. There were some outright errors and misleading statements. For example, on page 3-13 in regards to dive computer calculations we have this...

$1500 + luck + 25 years is not very encouraging.

We all need to trust someone at least to some degree. In regards to analyzing the O2 in the tank he can read the %O2 himself rather than taking someone's word for it. Also, to substantiate that the person has properly analyzed the tank he can ask someone else at the shop to analyze it. If both...