Oceanograph — The dive computer for Apple Watch Ultra

The in-water display

Read your whole dive in a single glance.

Underwater, the touchscreen locks — so the screen has to think for you. Oceanograph shows the two numbers you read together, how deep you are and how long you can stay, as equal oversized heroes, with the ascent-rate bar always down the edge. No squinting. No scrolling for the number that keeps you safe.

No-stop time that escalates

NDL is green with headroom, amber as it shrinks, red when you are nearly out — you feel the change before you read it.

Decompression, made unmissable

When you owe a stop, the ceiling depth and time become as large as your depth, with total time-to-surface beneath.

Ascent rate you sense, not read

A persistent variometer down the edge — green within limits, amber, then red — plus a haptic pulse if you rise too fast.

A safety stop that counts you down

Arrives automatically in the 5-metre band, holds and pauses with your depth, and buzzes when it is complete.

Your logbook, on iPhone

Surface, and it's already logged.

No scribbling in a wet paper log on a rocking boat. The moment you surface, your dive syncs to a logbook that actually looks like one — every entry a card with its own depth profile, grouped by year, with the site, gas and conditions that made the dive.

Replay the whole dive

Scrub the full depth-and-temperature curve, with descent, bottom, ascent and safety-stop phases marked.

Sites, maps and marine life

GPS entry and exit points on a map, buddies, dive centres, species, photos and star ratings.

Recover every past dive

Import your entire history from Apple Health — even dives recorded with other apps — and export UDDF or CSV. No lock-in.

The season at a glance

Watch your diving get better.

A dashboard that turns a season of dives into something you actually want to open — depth trends drawn like a profile, dives by month, your depth mix, temperature against depth, and a yearly recap worth sharing.

Your records, kept for you

Deepest, longest, coldest, bottom time, sites and regions — tallied automatically.

On-device dive debrief

An automatic read of each dive — ascent discipline, safety-stop quality, thermal exposure — computed privately, free.

Plan it. Prove it. Dive it.

More than a computer.

Plan the whole dive with a full multi-gas deco planner. Carry your certs in a wallet that looks like the real cards. And reach for every safety tool exactly where you'd expect it.

Decompression planner — **Deco planner**Multi-gas, gradient-factor stops, gas and ppO₂ checks

**Certification wallet**PADI, SDI/TDI and more, with photos and expiry

Dive detail — **Every dive in detail**Profile, phases, map, gas and conditions

In the water

From the boat to 40 metres.

A real dive computer, a full logbook and planner, and every safety tool a diver reaches for — on the wrist you already wear.

Divers gearing up on the boat — Gear up with your plan, gas and no-fly status already on your wrist.

Giant-stride entry off the boat — Auto-launches the moment you descend — no fiddling on the surface.

Diver checking depth and no-stop time at 30 metres — At depth: how deep you are and how long you can stay, read at a glance.

Why Oceanograph

A technical computer, not a subscription toy.

Most dive apps stop at single-gas no-stop diving and lock your logbook behind a yearly fee. Oceanograph gives you the deco engine, the planning and the open data that serious divers expect.

Feature	Oceanograph	Typical subscription app
Live dive computer on Apple Watch Ultra
Multi-gas & trimix decompression		Single gas
Gradient factors you set yourself		—
16-compartment tissue view & SurfGF		—
Full multi-gas deco planner		No-stop only
Import every past dive from Apple Health		—
Open export — UDDF & CSV, no lock-in		—
How you pay	Free log · Pro from $0.99	Subscription only

Comparison reflects common single-gas, subscription-only dive apps for Apple Watch Ultra. Feature sets change; check each app's current details.

Pricing

Log dives free. The computer is Pro.

Everything runs through Apple — no separate account, nothing harvested, cancel anytime. One week free.

Free

$0

Automatic dive logbook with profiles and maps
Import your history from Apple Health
Dashboard, records and Dive Wrapped
On-device dive debrief

Pro

$79.99/year · $9.99/mo

The live dive computer on Apple Watch Ultra
Real-time decompression, NDL and safety alarms
Multi-gas planner — gradient factors, gas and ppO₂
UDDF and CSV export — no lock-in
Family Sharing included

Subscribe for $79.99 a year or $9.99 a month (one-week free trial), or grab a pass for a single trip — from $0.99. The logbook and the on-device dive debrief are free for everyone, forever.

Questions

The details divers ask about.

Which Apple Watch do I need?

Any Apple Watch Ultra — generation 1, 2 or 3. Every Ultra has the same EN13319-certified depth gauge and water-temperature sensor to 40 m, so the dive computer runs identically on all of them. The logbook, planner and Apple Health import also work on iPhone on their own.

Is it safe to dive with?

Oceanograph is a precision instrument, not a substitute for training or for a backup. Decompression models are statistical — no computer removes the risk of decompression sickness. Dive within the limits of your certification, always carry a redundant computer or tables, and treat every number as guidance, not a guarantee.

Can I bring my existing dive history?

Yes. Oceanograph reconstructs every dive your Apple Watch has ever recorded from Apple Health — including dives logged with other apps — so your logbook is full from the first launch. You can also export everything as UDDF or CSV at any time. No lock-in.

What if I only dive a few times a year?

The logbook, Apple Health import, dashboard and on-device dive debrief are free forever. When you want the live computer and planner for a single trip, a Day Pass is $0.99 and a Week Pass is $4.99 — no subscription required. Divers who go often can subscribe at $79.99/year or $9.99/month with a one-week free trial.

Do I need to run other software or an account?

No. Everything runs on your iPhone and Apple Watch, and purchases go through Apple — there's no separate account to create and nothing is harvested. Your dives sync privately through your own iCloud.

Who makes Oceanograph?

Oceanograph is built by Emouna LLC. Questions or feedback are always welcome at [email protected].

Precision you can verify

The same algorithm the best computers use — proven, not promised.

Oceanograph runs the published Bühlmann ZH-L16C model with gradient factors, integrated with the exact Schreiner solution — the same class of engine as Shearwater and the Subsurface planner. Every coefficient is locked, and every result is checked against reference values on every build.

ZH-L16C

Bühlmann with gradient factors

16

tissue compartments, nitrogen and helium

87

automated engine tests, green on every build

40 m

EN13319-certified operating depth

Safety first, always

A precision instrument — not a substitute for training.

Diving is inherently dangerous. Decompression models are statistical — no computer or algorithm eliminates the risk of decompression sickness.
Use Oceanograph only if you are a certified diver, and dive within the limits of your training. Never rely on any single device — carry a redundant, independent computer or tables.
Oceanograph is not a medical device and provides no medical advice. Consult a physician about your fitness to dive.

Be first in the water.

Oceanograph is launching soon. Leave your email and we'll tell you the moment it's on the App Store — no spam, just the launch.