Most divers don't pursue MD or deco certs. Gas planning needs to be introduced as soon as possible and it need not be confusing if presented properly.
1/2 out, 1/2 back isn't a plan, it's a recipe for disaster. While the concept of gas planning in relation to dive planning is a new concept...
I'm referring to a BC which has the bladder in the back. A wing would be an example of back inflate, but many jackets are also back inflate, the Black Diamond, for example.
Three things can affect your trim, AFAIK... Ballast, buoyancy and energy.
It sounds like your ballast is balanced, so I'm...
Just to be sure I understand, pool session one was conducted in a hot tub?
As to the snorkel/inflator issue, the inflator hose should be retained by a velcro strap, which is typically a bit above nipple level. Your snorkel shouldn't be riding that low, so if you develop muscle memory to start...
There's a lot of different methods you could use. The most effective will depend on your kid. The first thing I teach kids is that they already use tables. Anyone who can follow a multiplication table can work the tables, which is the good news. The bad news is that a simple error can result in...
1. Why did it happen?
I wanted more time with a Pacific Electric Ray
2. What depth?
3. What was your reaction?
I don't recall any reaction, it was a conscious choice.
4. What was your ascent rate?
5. Did you have to go to the chamber?
With the exception of the long hose, my gear is no more complicated than it was in 1978. Tank, first stage, second stage, secondary second stage, pressure gauge, BP/W. Nothing more, nothing less.
What complications are you referring to?
A little late to report, but did the Black Water Night Dive on the Big Island last Wednesday. Bottom was somewhere deeper than 7000' and my max depth was a bit over 50'. We splashed at about 22:30 and spent :50 seeing things I never knew existed.