The one course you really need in addition to the OWD is the
Nitrox course. It’s all about the benefits of diving with Nitrox—a
breathing gas that contains less nitrogen and more oxygen. Because
you absorb less nitrogen when using it, it’s a popular alternative
to air and is often offered for free. However, to be allowed to use it,
you must have a Nitrox certification. You can get that here—
online, and still with better quality than the average
in-person Nitrox course.
The first step is the Nitrox 32 certification; for that,
you really just need to study the theory. You’ll receive it as soon as you’ve
completed the exam. Then, as soon as you have access to an analyzer,
we’ll hold a short workshop on how to analyze
and mark the tank—and you’ll be cleared for the 40% mix.