Gear and equipment familiarity.
Your ANDP course shouldn't be the first time you dive doubles. It shouldn't be the first time you are in a drysuit. There are courses tailored to those things.
You should have a good understanding of the basic kicks, know what they are and how to do them. If you...
Correct, the seal should lay flat against your neck. If they are too tight, it will try and roll. Insert a two liter bottle through the neck seal and cut with a new razor blade. Do not lift the blade, make one continuous straight cut. Scissors tend to leave a ragged edge. Stress risers along the...
I was 34. I was at the point that I was spending thousands of dollars per year on open circuit mixed gases. It finally actually made financial sense to make that leap. I haven't looked back, but I dive equal amounts OC and CC these days.
He is correct, it is a very loaded question. Where are you located, where will the compressor be located? What are you planning to fill, how often?
The PE100 is a version of the Junior correct?
If so, they are suitable for intermittent filling of single tanks with air with factory filtration.