Teaching Enriched Air: What New Nitrox Divers Get Wrong

Enriched Air is usually the first specialty a new diver takes, and its reputation as an "easy" course sometimes tempts instructors to rush it. In practice, a handful of mistakes come up repeatedly and are worth addressing directly rather than skimming past. The most common is treating maximum operating depth as an afterthought rather than the central planning step it actually is - students need to genuinely understand why a richer gas mix lowers their depth limit, not just memorise a number. Analysing and logging a cylinder's oxygen percentage before every dive is another habit that gets taught in the classroom but not always reinforced enough in practice; it needs to become automatic, not optional. Confusing enriched air's benefits - longer no-decompression limits, shorter surface intervals - with an excuse to dive more aggressively is a subtler mistake worth addressing head-on in discussion. Nitrox genuinely is a straightforward specialty to teach well, but "straightforward" should never mean "rushed." A student who leaves with real understanding, not just a certification card, is far less likely to develop bad habits later.