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I have certification cards from at least ten different agencies and I teach courses certified by five. Take the courses you are interested in without regard to the agency. It is the knowledge and training that is important, not letters on the card.

The only computer that you realy need is the one between your ears.

Your DIR knife is fine for diving in caves where the only thing you will ever have to cut is string. Up here in the Great Lakes wrecks you would probably cut your dry glove and maybe yourself with it before you dropped in the wreck where you would never find it again. A tool must be chosen...

I require my students to dive with a depth gauge / timer or a computer that set to "gauge mode" during tech training.

Most of what we are taught (and what we think we know) is wrong. It's always been that way. Science moves on and we refine our techniques and technology. We learn and we progress. The books never quite catch up. We do the best we can. It is always the best course to read all you can from...

There is no specification for baloon grade helium. It may be mixed with oxygen or it may be mixed with air and the ratios are highly variable. The only thing you know for sure is that there is enough helium in the mix to float a baloon.

I did not say that I have them invert. To cross a floating line on the surface you simply grab it with your hand, hold it up and pivot under it. Trying to go over it is just about guaranteed to get you hung up.

I have found by years of observation of divers on my charter boat that divers will not utilize emergency equipment that they are carrying unless they have actually practiced using it beforehand. Here are some of the exercises that I include in my entry level classes: Using the alternate...

A sail boat doesn't make any noise either but its keel can part your hair.

Yesterday we were diving in a fog. Visibility on the surface was about 50 yards. An SMB or mirror would not have been of much use. Choppy waves and heavy rain can also reduce visibility to the point that such devices cannot be seen.

A 72 is about 12 litres.

A situation in which a diver is caught in a current and drifting away from the boat is always a difficult problem. Each situation, however, must be evaluated on its own. Some things to consider: A diver in a one knot current (about as fast as a person can swim with MF&S without scuba for...

Gas absorption is not dependent on the volume of gas you breathe, only on the partial pressure. Also: The temperature of the gas in your lungs is not the temperature of the gas in the tank.

You will find some of the best wreck diving anywhere in the great lakes. Lake Michigan offers some truly unique diving.

Learn to breathe. Take a class in Yoga, meditation, tai chi or any martial art.

Call around to the dive shops in your area to find one that has an instructor who likes to work with kids. Not all instructors are good with younger students. I have done a lot of work with high school students and enjoy working with them but I usually end up wanting to drown 12 year olds. I...

I think Kirby Morgan still makes a metal second stage. You might, however, have to go to a commercial supplier to buy one.

When you are on your back the diaphragm of your regulator may be several inches higher than your lungs. This results in an increase in differential pressure. What this means is that you are trying to breath air that is at a significantly lower pressure than your lungs. i. e. You have to suck...

Since SAC calculations are, at best, good to only one significant figure, 80 CF is good enough.

Not being able to run your compressor while underway would severly limit the logistics of your operation. That would mean not being able to move from one location to another during a surface interval if you need to fill tanks.