Questions to Ask a Dive Operator | Ocean Calling Retreats

Pool training before the first open-water dive. Photo: Ocean Calling Retreats.

Most advice about choosing a dive operator is written for the moment you walk into the shop: look at the tanks, look at the boat, feel the mood. That is useful, but it comes late, when you have already paid. This page is the other half. It is the short conversation to have while you are still only an email, and still free to choose someone else.

We have a longer piece on what makes a dive operator ethical, and another on choosing one as a solo traveller. This one is narrower on purpose: the questions, why they matter, and what a good answer sounds like.

Why ask before you book, not when you arrive

Once you are on the island, with a non-refundable room and a booked boat, it is very hard to walk away from a shop that feels wrong. You tell yourself it is probably fine. Asking before you pay protects you from that very human trap.

It also shows you how the operator communicates. A good shop answers specific questions with specific answers, quickly and without getting defensive. A shop that replies "don't worry, we are very safe" to every question is telling you something too. Scuba Diving magazine, in an article written with input from DAN, says hesitation when you ask about emergency procedures is a major red flag.

Oxygen and first aid: the first questions to ask a dive operator

The Divers Alert Network (DAN) suggests asking these before a dive trip abroad. Is emergency oxygen on every dive boat, not only at the shop? Can the equipment give high-concentration oxygen to a diver who is breathing and to one who is not? How long does the oxygen last? Are the staff trained in oxygen first aid, and is there a first aid kit on every boat?

DAN Asia-Pacific adds a practical detail for remote places: is there enough oxygen on the boat to reach medical care from the furthest dive site, and can the system help more than one injured diver? DAN Europe makes the same point, saying an operator should be able to give 100% oxygen to at least two divers. These are not luxury extras. For an injury like decompression sickness, oxygen first aid is the first step while help is on the way.

A good answer is calm and concrete: "Yes, every boat has an oxygen kit, it lasts this long, and all our guides have current oxygen first aid training." A weak answer is "we have oxygen at the centre".

"What is your emergency plan?"

DAN Europe explains that writing an emergency assistance plan is the operator's job. It should cover first aid at the site and fast transport to a suitable medical facility. The Scuba Diving article lists the situations a good plan should cover: a lost diver, suspected decompression sickness, equipment failure and bad sea conditions.

So ask: who calls for help, and how? Which hospital or recompression chamber do you work with, and how long does it take to get there from your usual sites? Is there radio or phone signal at those sites? An operator who has really practised a plan can describe it in a few sentences. If the answer is vague, the plan probably is too.

Gear checks, group size and the guide

Ask how often rental regulators are serviced and when the tanks were last inspected. Rules differ by country, so take this only as an example. In the United States, DAN explains that federal rules require scuba cylinders to be requalified every five years, with a visual inspection and a hydrostatic or ultrasonic test, for anyone who fills or rents them as a business. A yearly visual inspection is recommended by the Compressed Gas Association and often required by fill stations, but it is not a federal law. Outside the US the rules are different, so ask the shop which ones apply there. A good shop knows, and is not offended.

Then ask about group size. I could not find one universal guide-to-diver ratio that applies everywhere, so I will not give you a number. What matters is that the shop gives you their number, and explains how it changes for beginners, drift dives or deeper sites. "We always have enough staff" is not a ratio.

Ask too who will lead your dives, and whether you can talk to them. You want to know that the guide knows the currents and the site. And ask what the briefing covers. A careful operator explains depth, conditions, entry and exit, signals and buddy pairs before every dive, not only the first one.

Standards, certification and insurance

There is an international standard for dive shops: ISO 24803:2017, "Recreational diving services, requirements for recreational diving providers". It covers introductory dives, snorkelling trips, training, guided dives for certified divers and equipment rental, and it does not cover freediving. It replaced an older 2007 version. The full text is sold by standards bodies, so I could not read its detailed requirements, and not every good shop is certified against it. You can still ask whether they are.

Ask also whether the guides hold current professional certification with a recognised training agency, and whether the business has liability insurance. And check your own side: do you have dive insurance that covers evacuation and chamber treatment where you are going?

The ethical layer: how do they treat the reef and the animals?

This question tells you the most about an operator's values. Ask directly. Do you allow guests to touch, chase or feed wildlife? What does the guide do if a guest does it anyway? Do you use mooring buoys, or drop anchor on the reef? Do you use bait or food to attract animals?

One helpful sign is Green Fins. It is a programme started by the UN Environment Programme in 2004 and now led by the UK charity The Reef-World Foundation. Member dive and snorkel operators promise to follow a 15-point code of conduct against harmful habits like anchoring, fish feeding and chemical pollution. Certified members are assessed in person every year, and joining is free. Green Fins only works in a limited number of countries, so a shop without it is not automatically bad. But a shop that has never thought about these questions will probably not protect the reef when a guest wants a selfie with a turtle.

This matters to us personally. Ocean Calling only works with vetted local operators. On our hosted retreats we keep small groups of six guests at most and unhurried days, and we never chase, touch, feed or bait wildlife. Guests can skip any dive without explaining why.

Cancellations, weather and the small practical things

Ask what happens if the weather or the sea cancels a dive. Is there a refund, a new date or a credit? And who decides: the captain, based on conditions, or someone who wants a full boat? An operator who lets the captain cancel for safety without the guest losing money is putting safety first.

Then the small things that make the day easier. Ask whether the boat has shade and somewhere dry for your things. A roll-top dry bag keeps a phone and papers dry on a wet deck either way. Ask if rental masks come in different sizes. If rental masks never fit your face, bringing your own low-volume mask and snorkel can save a lot of frustration underwater.

Reading the answers, not only collecting them

None of these questions is meant to interrogate a good operator. A well-run shop will answer most of them before you finish asking, sometimes with a little pride. Look at the pattern: specific, calm answers, or vague, defensive, annoyed ones. Trust that pattern. If something still feels off after the conversation, that feeling is information too, and it is fine to keep looking.

If you are comparing retreats rather than single dives, our list of questions to ask before booking a freediving retreat covers the bigger picture. And if this made you curious about diving with teams we have already vetted, you can explore our retreats.

Questions people ask

What is the most important question to ask a dive operator?

Ask about the emergency plan. DAN Europe says the operator is responsible for an emergency assistance plan that covers first aid at the site and fast transport to medical care. A good operator can explain it clearly in a few sentences.

Should every dive boat carry oxygen?

DAN recommends asking if emergency oxygen is on all dive boats, if it can give high-concentration oxygen to breathing and non-breathing divers, how long it lasts, and if the staff are trained to use it.

How often should scuba tanks be inspected?

It depends on the country. In the US, federal rules require requalification every five years for cylinders that are filled or rented commercially, and the Compressed Gas Association recommends a yearly visual inspection. Ask the shop which local rules apply.

Is there an international standard for dive operators?

Yes, ISO 24803:2017 sets requirements for recreational diving providers, including training, guided dives and rental. It does not cover freediving, and not every good shop is certified against it.

What is Green Fins?

A programme started by UNEP in 2004 and now led by The Reef-World Foundation. Dive and snorkel operators promise to follow a 15-point environmental code of conduct, and certified members are assessed every year. Joining is free.

What group size should I accept?

We could not find one universal ratio. Ask the operator for their number and how it changes for beginners or difficult sites. On our hosted Ocean Calling retreats, groups are six guests at most.

Wildlife encounters are never guaranteed and never forced. Ocean Calling works only with vetted, ethical local operators, and every animal is free to approach, or not, entirely on its own terms.

Sources & further reading

Further reading on Ocean Calling: What makes a dive operator ethical · Choosing a dive operator as a solo traveller · More from the journal · Wildlife & the law · See the retreats · Ocean Atlas

Questions to Ask a Dive Operator Before You Book