We lived on Miyakojima for a couple of years, and one thing happened over and over: someone would try a single guided dive on holiday, come up grinning, and ask the shop the same question before they'd even dried off — "How do I get a licence so I can do this myself?" This article is our answer to that question, written for someone flying in from abroad who has decided (or is close to deciding) that they want to learn to dive in Japan.
Here's what you get below: what the "licence" actually is, what the first certification lets you do, what the course involves, whether you need to be able to swim, roughly what it costs and how many days it takes, and how to fit it into an Okinawa trip without ruining your flight home. Numbers below use PADI as the example, because it's the most common agency in Japan; other agencies differ slightly.
First: it's a "C-card", not a government licence
The word "licence" is a little misleading. Recreational diving certification in Japan — and worldwide — is not a national licence like a driving licence. It's a C-card (short for Certification Card): proof from a private training agency that you've completed a course and can dive within certain limits. Because it's a certification rather than a state licence, there's no exam you "fail out" of and, in general, no expiry date that makes it invalid.
Several agencies issue these cards, and the big ones are internationally recognised: PADI, SSI and NAUI are the names you'll see most in Japan. A card from one is accepted by dive shops of any agency, anywhere in the world. That's the key point for a traveller — certify in Okinawa and you can walk into a shop in Thailand, Egypt or the Caribbean and join a dive.
For your first card, don't agonise over which agency. The course structure (theory, confined-water practice, open-water dives) is almost the same across all of them, and the card carries the same weight internationally. What actually matters is finding a shop and an instructor you get along with, ideally one used to teaching in English. We'd genuinely tell a friend to pick by the shop, not the logo.
What the first card lets you do
The certification most beginners aim for is Open Water Diver. It's the first level that lets you dive with a buddy, making your own decisions, rather than under an instructor's direct supervision. There's also a shorter, more limited step called Scuba Diver, which some people take when they're short on time and finish later.
| Certification (PADI) | What you can do | Max depth |
|---|---|---|
| Scuba Diver | Dive under an instructor's supervision | 12 m (about 40 ft) |
| Open Water Diver | Dive with a buddy, on your own judgement | 18 m (about 60 ft) |
For comparison, a single try-dive (no certification, an instructor holds onto you the whole time) reaches about 12 m, and once you hold Open Water you can join independent fun dives. If you're still weighing a try-dive against going straight for the course, our Okinawa diving guide walks through which sea suits a first-timer.
What the course actually involves
An Open Water course has three parts, and it helps to picture them before you book:
1. Knowledge / theory. How pressure affects your body, how the gear works, the safety rules. With PADI this is done through eLearning — videos and quizzes you can do on your phone or laptop, ideally before you travel (more on why below).
2. Confined water. In a pool or calm, shallow water, you practise core skills: clearing a flooded mask, controlling your buoyancy, recovering your regulator. PADI requires at least five confined-water sessions.
3. Open water. The real thing — using those skills in the sea. PADI's Open Water course includes at least four open-water dives, usually spread over two days.
People worry about "failing", but the course isn't built to fail you. Instructors keep practising a skill with you until it clicks; the pace bends to you, not the other way around. That's the whole design.
Do you need to be able to swim?
This is the question that stops a lot of people from signing up, so let's be precise. Unlike a try-dive (no swimming required at all), an Open Water course does include a water-comfort check. But it's gentler than it sounds. With PADI you need to, at some point during the course:
| Skill | PADI standard | Condition |
|---|---|---|
| Swim | 200 m with no gear, or 300 m with mask, fins and snorkel | Non-stop. Any stroke. No time limit. |
| Float / tread water | 10 minutes with no gear | Any method — floating on your back counts. |
Notice there's no clock. Breaststroke, doggy-paddle, drifting on your back — all fine. The 300 m option lets you wear fins, and a lot of people find that easier than swimming 200 m bare, because the fins do the work. The float is about relaxing on the surface, not endless motion. PADI's own guidance says you don't need to be a strong swimmer, just able to swim. If water itself makes you anxious, tell the shop when you book — and one honest tip from us: an hour in a pool at home beforehand, just practising floating and slow breathing, takes most of the nerves out of it.
Cost and how many days it takes
Prices swing wildly, and there's a reason: an Open Water course price is a sum of parts, and cheap ads usually quote just one part. Here's what actually goes into it, so you can read a "from ¥XX,XXX" ad properly:
| Cost item | What it is | Often billed separately? |
|---|---|---|
| Tuition | The instructor's teaching | Usually included |
| Learning materials | Textbook / eLearning | Sometimes extra |
| Certification fee | Issuing the actual C-card | Sometimes extra |
| Gear rental | Wetsuit, tank, BCD, regulator | Sometimes extra |
| Facility / boat fees | Pool time, boat to the dive site | Sometimes extra |
| Transport & lodging | Getting to the sea, staying nearby | Almost always on you |
So a headline like "from ¥30,000 (about $200, as of September 2026)" is typically the tuition alone; materials, the card fee and gear can push the real total well above it. We won't quote you a single magic number, because an honest one doesn't exist — instead, before you book, ask the shop three things: (1) does the price include materials, certification and gear rental? (2) are boat and transport for the sea dives separate? (3) in what situations would extra charges appear? A shop that answers clearly, with figures, is usually the one you can trust on price.
On days: be wary of "get certified in one day" ads. PADI states plainly that mastering all the knowledge and skills in two consecutive days or less is very difficult. Realistically there are two patterns:
Split — eLearning at home, pool sessions on weeknights, sea dives at a weekend. Good if you're studying near where you live. Intensive — a few concentrated days at a destination like Okinawa. Either way, the more theory you finish in advance, the fewer days you need on site.
Getting certified on an Okinawa trip
Plenty of visitors fold the course into an Okinawa holiday, and it works — if you respect the schedule. The single biggest lever is doing the eLearning theory at home before you fly, so your days on the island go entirely to pool and sea. Here's a schedule that tends to work:
| Day | What you do |
|---|---|
| Arrival | Travel, shop check-in, gear fitting. Don't overdo it — rest. |
| Day 2 | Confined-water (pool) skills + first open-water dives |
| Day 3 | Remaining open-water dives → certification |
| Last day | Don't dive. Shopping, a beach walk, the market. |
That last line is the one people get wrong. After diving, dissolved nitrogen needs time to leave your body before you fly. The Divers Alert Network recommends waiting at least 18 hours after multiple dives over several days before flying (DAN — Flying After Diving, as of September 2026). A course is exactly that — several dives over several days — so keep your final day dry and build the schedule backwards from your flight home.
Sources: PADI Open Water Diver course and DAN — Flying After Diving (both as of September 2026).
One more Okinawa-specific risk: typhoons and rough seas. Sea dives get cancelled when the water is up, which can push your whole schedule back. Two defences: leave a spare day (put the course early in the trip and keep a buffer at the end), and ask the shop in advance whether you can finish any remaining dives later at a partner shop near home. Our Okinawa diving guide covers the seasons and typhoon timing in more detail.
Practical notes for first-time visitors to Japan
A few things that specifically trip up overseas travellers:
Book ahead and expect to confirm. Good shops fill in summer. Booking online in advance is normal, and the shop will often message or phone you the day before with a meeting time and a weather check — so keep your phone reachable. That's where a working data plan earns its keep; if you haven't sorted connectivity, see our Japan eSIM guide.
Ask about English up front. Not every shop teaches in English, and you want an instructor you fully understand for a safety course. PADI eLearning is available in English, which handles the theory; confirm the in-water teaching too.
There's a medical form. You'll fill in a diver medical questionnaire before the course. Certain conditions (heart, lung, ear issues, pregnancy, some medications) mean you need a doctor's sign-off first. This isn't Japan being fussy — it's a global diving standard. Declare honestly; the sea isn't the place to hide something.
Cash and no tipping. Big shops take cards, but smaller island operators can be cash-only, so carry some yen. And you do not tip your instructor in Japan — a genuine thank-you is the custom, not an envelope. It feels odd if you're American; nobody expects it.
FAQ
Can I really get certified in a 3-night Okinawa trip?
Often yes — if you finish the eLearning theory before you fly. That leaves two to three days on the island for the pool and sea dives, which is enough for many shops' Open Water plans. Build in a spare day for weather, and plan not to dive on your last day so you can fly home safely.
Do I need to speak Japanese to take the course?
No, but choose a shop that teaches in English. PADI's eLearning theory is available in English, and shops used to international divers will run the in-water training in English too. Confirm this when you book — it matters more for a certification course than for a casual dive.
Is the certification valid outside Japan?
Yes. A C-card from PADI, SSI, NAUI and the other major agencies is internationally recognised, with no expiry. Certify in Okinawa and you can join dives worldwide — though if you've had a long break from diving, a refresher is a smart idea before a deep or challenging dive.
Our honest take, after watching a lot of people start here: don't overthink the agency, do the theory before you fly, be upfront about swimming and your health, and never dive on your last day. Get those four right and learning to dive in Japan is one of the best souvenirs you can bring home — one that works on every coast for the rest of your life. When you're ready to plan the trip around it, you can compare Okinawa hotels on Trip.com and base yourself near a dive shop.
