Tips & skills

Fix your buoyancy before you fly

Vacation divers lose the first two days of every trip re-learning trim, then get good just in time to go home. The fix is boring: get in a pool or a quarry before the trip and spend one tank doing nothing but hovering.

The one-tank tune-up

1. Weight check at the surface. Empty BCD, normal breath, you should float at eye level and sink slowly on an exhale. Do this with the exposure suit you'll actually wear on the trip.
2. Re-check at 15 ft with 500 psi. Most people are 2–4 lb heavy because they weighted for a full tank. Drop weight until you can hold a stop with an empty BCD and a normal breath.
3. Hover horizontal for five minutes. Arms folded, fins still, eyes on a fixed point. If your fins drift down, move a pound from your belt to a trim pocket up high. If your head drops, the opposite.
4. Breathe to move. Inhale to rise six inches, exhale to sink. Don't touch the inflator. This is the skill; everything else is weighting.

Air consumption isn't a personality trait

“I'm just an air hog” is a thing people say instead of measuring. Your surface air consumption (SAC) rate is a number, and numbers can be lowered.

Measure it once

On a flat, easy dive: note start and end pressure, average depth, and minutes. Then:

SAC (psi/min) = (psi used ÷ minutes) ÷ ((avg depth ft ÷ 33) + 1)

Example: 2,000 psi over 40 minutes at an average of 50 ft → (50 psi/min) ÷ 2.5 = 20 psi/min on an AL80. Around 15–20 is typical for relaxed recreational divers; under 15 is very good. Convert to cubic feet if you switch tank sizes (an AL80 holds about 77 cf at 3,000 psi, so 1 psi ≈ 0.026 cf).

The three habits that move it

• Stop kicking. Most air goes to muscle. Good trim plus a slow frog kick cuts consumption more than any breathing trick.
• Slow the exhale. Don't skip-breathe (headaches, CO₂ buildup). Just breathe normally in, and let the exhale take longer than the inhale.
• Get warm and get calm. Cold and anxiety both burn gas. A thicker suit or a hood on a “warm” 78°F dive often pays for itself in bottom time.

Pack for the dive, not the airport

Always bring your own

• Mask. A mask that fits your face is the single biggest comfort item and rental masks are a lottery. Bring a spare strap.
• Dive computer. Your profile history, your conservatism settings, your alarms. Rentals reset every diver.
• Regulator if you own one and it's been serviced in the last year. Nothing ruins a wall dive like a free-flowing rental second stage.
• Surface marker buoy (SMB) and a small reel or spool. Non-negotiable for drift diving and boats. Know how to shoot it.
• Save-a-dive kit: mask strap, fin strap, O-rings, mouthpiece and zip tie, a small multi-tool, defog, zinc, reef-safe sunscreen, ear drying drops.

Usually rent

• Tanks and weights. Always.
• BCD on short warm-water trips if the airline math doesn't work. Try it on and check the inflator before the first dive.
• Wetsuit if the destination is warm and you're on a budget — but a rental 3mm that's been in the sun for two seasons is closer to a 1mm.

Weight and the airline

A full kit in a roller dive bag runs 35–50 lb. Weigh it at home. Fins are the awkward item — long-blade fins in a checked bag, or travel fins if you're flying regional jets.

Plan the trip like a dive

• Fly-after-dive buffer. Minimum 18 hours after multiple dives per day (24 is the comfortable number). Schedule the last dive day accordingly and use the final day for land things.
• Dive insurance. Regular travel insurance often excludes scuba or caps it. Get a policy that explicitly covers hyperbaric treatment and evacuation (DAN is the well-known one; there are others). A chamber ride without it is a five-figure bill.
• Certification card and logbook. Physical card or the digital version screenshot on your phone. Some ops want to see recent dives; if it's been more than a year, book a refresher before you go, not on day one.
• Nitrox. If you're doing three or more dives a day for a week, a nitrox cert pays for itself in less fatigue and more bottom time. It's a weekend course.
• Local cash. Marine park fees, tips for the crew, port fees — many are cash-only and add up to $50–150 a week.
• Build in a blown-out day. Wind happens. A trip planned to the last tank has no slack.

Choosing an operator

Reviews tell you about the boat snacks. Ask these before you pay a deposit:

• How many divers per guide, and what's the maximum on the boat?
• Do you group by experience? Can I dive my own profile with my buddy?
• What's your bottom-time policy — fixed time, or first diver to 700 psi?
• Is oxygen on the boat? When was the last time staff trained on it?
• What's the cancellation policy for weather?
• Do you rent computers, and are they included?

A shop that answers these quickly and specifically is a shop that has thought about them. A shop that gets annoyed is telling you something too.

Health & safety notes

• Ears. Equalize early and often — before you feel pressure, not after. If it won't clear, go up a few feet and try again. Never force it. Ear drops (half rubbing alcohol, half white vinegar, or a commercial product) after each day keep swimmer's ear away.
• Hydration and alcohol. Dehydration raises DCS risk. Water all day; save the beer for after the last dive of the day.
• Seasickness. Take the medication the night before, not on the dock. Eat something bland. Sit low and mid-ship, look at the horizon.
• Sun. Reef-safe sunscreen, a long-sleeve rash guard, and a hat. Sunburn on day one ruins days two through seven.
• Medical clearance. If anything on the diver medical questionnaire is a yes, see a physician who knows diving before the trip, not the op's front desk.

Checklists

Pre-trip (a week out)

• Cert card / digital card
• Dive insurance confirmation
• Computer battery checked
• Regulator service date confirmed
• Mask strap + spare
• Fin straps checked
• Save-a-dive kit restocked
• SMB + spool
• Logbook / weight notes
• Reef-safe sunscreen, rash guard
• Seasickness meds
• Ear drops
• Cash for fees and tips
• Fly-after-dive buffer on itinerary

Pre-dive (every dive)

• Air on, full turn, pressure checked
• BCD inflates and holds; dump valves work
• Weights in and secured; release known
• Releases and buckles checked by buddy
• Both regs breathe; octo location agreed
• Computer on, nitrox mix set if applicable
• Mask defogged, fins on last
• Plan: max depth, turn pressure, ascent, signals