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Quick answers
Which local rescue or training agency should I check first?
Use the local lens: coastguard/federation norms and the shop briefing for that bay — not a blog visibility claim.
What is a typical first depth limit?
Many Open Water cards are written to 18 m. Further training raises that toward 30–40 m inside recreational no-stop diving.
Who invented the Aqua-Lung?
Emile Gagnan and Jacques Cousteau’s 1943 demand regulator is the usual origin of open-circuit scuba.
Is Nitrox required?
No. Enriched air is a common extra course. Air remains the default.
Can people stop after a course?
Yes. Skills decay. A checkout after a layoff is normal.
What does recreational exclude?
Planned decompression, overhead wreck or cave penetration, and untrained solo diving.
A typical Open Water path is theory, confined-water skills, and four open-water dives. The craft after the card is buoyancy, gas awareness and turning the dive early.
The card is a start. The first fifty logged dives are the actual course.
Steps
- Pick an agency and a medical path
Read the form. Some answers mean a physician.
This atlas does not interpret the form.
- Confined-water skills
Mask clear, regulator recover, buoyancy in a pool or lagoon.
Ugly in a pool is dangerous in a swell.
- Four ocean dives
Briefed, guided, shallow. Repetition, not a deep trophy.
Log them while the briefing is fresh.
- Practise buoyancy on sand
The reef-etiquette chapter is the next lesson.
A 10 cm hover saves coral and air.
- Plan gas and no-stop time
A conservative turn pressure; computer as a check.
The first person to 70 bar leads.
- Dive with a pro after a layoff
Skills expire.
A guided house reef is cheaper than a chamber story.
Skills
- Buoyancy — The whole sport.
- Gas awareness — Minutes, not superstition.
- Equalisation — Early, often; abort if it will not go.
- Buddy checks — BWRAF or the local mnemonic — actually done.
- SMB / DSMB — In any boat-diving culture.
Progression
- OW 18 m — The first card.
- Nitrox plus fifty logs — A serious recreational diver.
- Deep and night as separate chapters — Not a bundle to rush.
- Rescue courses — Useful; still not a medical licence.
Common mistakes
- Chasing 40 m on dive eight — Depth is not a personality.
- Skipping the buddy check — The classic incident opening.
- Kneeling for a photo — See reef-etiquette.
- Flying the same day — Agency tables exist; this page will not invent one.
The method is a conservative turn and a hover. Depth is a later, optional sentence.