The boundary
Gas: Open-circuit air/Nitrox. That sentence limits the claim. It does not crown a person, a people, or a nation.
Open-water scuba to 18–40 m — PADI, SSI and the difference between a holiday course and a craft. Gas is a boundary — Open-circuit air/Nitrox — not a winner and not a league table.
Do not turn Gas (Open-circuit air/Nitrox) into a ranking. For Recreational scuba it only sits next to OW course: Pool + 4 dives typ..
Check each criteria to confirm findings against the atlas verdict.
Gas: Open-circuit air/Nitrox. That sentence limits the claim. It does not crown a person, a people, or a nation.
OW course adds a second limit: Pool + 4 dives typ.. If the two limits disagree, keep both and do not average them into a prize.
Use the published tool for Recreational scuba with this limit in view. Check 2 of 4 is whether the axis you care about even includes Gas.
This is a reading check for the atlas, not personal advice, a live price, or a booking. Not this page: A live briefing.
This is a reading check for the atlas, not personal advice, a live price, or a booking.
Open the topic: Recreational scuba · Open the tool
🔎 Caribbean: read “Belize park” before you decide · 🛑 Caribbean: what “Bonaire park” does not decide · 📍 Competitive swimming: the local fact in “Tech-suit era” · 🔎 Freedive safety: read “Rescue” before you decide · 🛑 Freedive safety: what “This page” does not decide · 📍 Freediving: the local fact in “Rec depths” · Decision checks