What Is Nitrox Mode on Dive Computers? EAN Settings Explained
Ever wondered why some divers get more bottom time than others using the same dive computer? The secret often comes down to one overlooked setting. In this episode, Ray Hollister draws on decades of diving experience to explain nitrox mode—what it does, how it works, and why forgetting to set it correctly can send you to a recompression chamber. Whether you're new to enriched air diving or just want to understand your equipment better, this breakdown covers everything you need to know about programming your computer for different breathing gases.
Key Takeaways
- Nitrox mode tells your computer what gas you're actually breathing. Think of it like telling your phone what language you speak—if you give it the wrong information, everything it calculates will be off. Your computer needs to know the exact oxygen percentage in your tank to keep you safe.
- Enriched air nitrox has more oxygen and less nitrogen than regular air. Normal air is about 21% oxygen, but nitrox bumps that up to 32% or 36%. Less nitrogen means your body absorbs less of the stuff that causes decompression sickness, like filling a sponge more slowly with water.
- Proper nitrox settings give you longer dive times before you need to surface. Because your body soaks up nitrogen slower with enriched air, your computer allows you to stay underwater longer—sometimes 20 extra minutes on a single dive.
- Your computer also watches for oxygen toxicity when in nitrox mode. Too much oxygen at depth can cause dangerous seizures, so your computer sets a maximum safe depth and sounds an alarm if you go too deep. It's like a speed limit warning for divers.
- Always reset your computer after switching gases. If you dive nitrox one day and regular air the next, leaving the old setting will mess up all your safety calculations. It's like using yesterday's weather forecast to plan today's picnic—the numbers just won't match reality.
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