How a first dive course works on an island
The usual first certification is called Open Water Diver, offered by agencies such as PADI and SSI. It has three parts: knowledge development (often done online before you travel), confined-water skill sessions in a pool or a calm shallow area, and four open-water training dives in the sea. Most people finish in three to four days.
Once certified, Open Water divers are qualified to dive to 18 meters (60 feet) with a buddy. Children can usually start a junior course from age 10, with a shallower depth limit for the youngest divers. Before the course you will fill in a medical questionnaire, and some conditions need a doctor's sign-off.
Many people save time on vacation by doing the theory at home, then finishing the dives on the island. Some do the pool sessions at a local dive shop before they travel and arrive ready for the open-water dives.
Try a dive before committing
If you are not sure diving is for you, most island dive centers offer a supervised try dive. PADI calls it Discover Scuba Diving. After a short briefing and a few skills in shallow water, you make a shallow dive with an instructor close by. It does not count as a certification, but parts of it may count toward a full course.
Conditions to save for later
Some of the world's most famous dives are not good first dives. Strong current dives in Komodo or the Maldives channels, deep walls, open-ocean shark dives in the Galápagos and wreck penetration in Chuuk Lagoon all call for experience and further training. Read our Pacific island scuba diving and Indian Ocean island scuba diving guides when you are ready for the next step, and our Caribbean island scuba diving guide for more easy islands.
For flights, insurance and what to pack, see the island dive trip planning guide.