Color information with a rotating NavDial. The O.i combines a 2.4-inch TFT display, digital compass and surface GPS entry/exit logging in a rechargeable, 100 m-rated wrist computer. Scuba and gauge modes use Bühlmann ZHL-16C with gradient factors.
Why choose O.i?
Supports three gases and up to three compatible optional transmitters, with visual and haptic alerts. Induction charging and Oceanic+ connectivity simplify logging. Battery life varies substantially with brightness.
Large digits and hose-connected air integration. The ProPlus 4.0 displays pressure and dive information in a familiar console format. Air, nitrox and gauge modes, two-gas capability, Bluetooth DiverLog+ connectivity and a replaceable CR2 battery support everyday diving.
Why choose ProPlus 4.0?
Its display digits are larger than the ProPlus 3, and its Dual Algorithm system offers DSAT or Pelagic Z+. Rated to 100 m. Confirm the compass and quick-disconnect configuration on the listing; this is not the ProPlus X.
A wrist computer stays in view with a glance. A console keeps pressure and dive information together on a hose-mounted instrument. Try both with your usual equipment and think about how you manage a camera, reel or other accessories.
Plan the air-integration setup
O.i wireless pressure monitoring needs a compatible transmitter. ProPlus 4.0 receives cylinder pressure through its high-pressure hose. Ask us to confirm regulator connections, transmitter generation and the complete configuration before purchase.
Learn the controls before the boat leaves
Review gas settings, alarms, conservatism and battery checks in the current manual. Use your training and an appropriate dive plan; the computer is a tool for following that plan.
Questions divers ask
Does surface GPS work underwater?
No. Surface GPS can record entry and exit coordinates; it is not live underwater GPS navigation.
Is a transmitter included?
Check the exact product listing and bundle. Do not assume a wrist computer includes a transmitter; contact us to confirm the complete setup.
Can Stuart Scuba help me compare other brands?
Yes. Use our comparison guide to narrow your preferences, then contact the shop to discuss display size, dive modes and compatibility.
Choose your next dive computer with Stuart Scuba
Tell us your certification, the dives you enjoy, your wrist size and whether you already own a transmitter. We can help you compare the complete setup before you buy. Serving divers in Stuart, Jupiter, West Palm Beach and beyond.
Specifications checked November 12, 2026. Features can depend on firmware, accessories and region. Depth ratings describe equipment limits, not a diver’s training or a recommended dive depth. Read the current manufacturer manual and practice operating your computer before diving.
