SUUNTO Eon Core Dive Computer

A dive computer tracks the actual depth and time profile you have dived and the tissue loading that follows from it, which is personal to you. A rented computer has no record of your recent diving, and swapping models each trip means relearning the display and menus when you should be focused on the dive. Owning one you know well is a genuine safety and comfort improvement.

No. A computer only tracks the profile of the diver actually wearing it, and even buddies who stay together do not follow identical depth and time profiles. Every diver needs their own computer, and passing one between divers or between dives is unsafe.

Conservatism settings make the computer's calculations more cautious, shortening allowed bottom times and adding margin beyond the base algorithm. Divers commonly add conservatism for factors such as cold, hard work, fatigue, or repetitive multi-day diving. How and when to adjust it is covered by your training and your computer's manual, so set it before you get in the water and follow what your computer tells you during the dive.

Broadly there are two types: user-replaceable batteries, often a coin cell that you or a shop swap along with resealing an o-ring, and sealed rechargeable batteries that charge from a cable or dock. Neither is universally better, as replaceable cells are convenient on remote trips while rechargeables avoid ever opening the case. Follow the manual exactly for any battery change, because an improperly seated o-ring or case is the usual cause of a flooded computer.

Yes, both change the picture, and both are governed by your training agency's guidance and your computer's instructions rather than any casual rule of thumb. Many computers have an altitude setting that must be configured before diving at elevation, and most display a no-fly or surface-interval countdown after a dive. Follow your computer and your training, and ask a dive professional or a dive-medicine specialist if you are unsure.

Rinse it in fresh water after every dive day, paying attention to the buttons and around any sensor openings where salt crystals form, and let it dry fully before storing. Keep it out of prolonged direct sun and extreme heat, and avoid pressing buttons while sand is on the case. Inspect the strap or bungee often, because a failed strap loses far more computers than a failed computer does.

A wrist computer is worn like a watch and read by raising your arm, while a console computer sits at the end of a hose with your other gauges. Air integration means the computer also displays cylinder pressure, either through a hose or from a wireless transmitter on the first stage, and often estimates remaining gas time. All of them run a decompression algorithm, so the real difference is where you read the information and how much of it you get.

Yes. The EON Core reads cylinder pressure wirelessly from the Suunto Tank POD over an inductive connection. Up to 20 PODs can be connected and up to 10 can be displayed on the computer at one time, which supports multi-tank and multi-gas setups. The Tank POD transmitter is sold separately and is not part of the EON Core box contents.

The EON Core offers Air, Nitrox, Trimix, Gauge and CCR (fixed point) modes, so it covers recreational through technical and fixed-setpoint rebreather diving. Decompression calculations use either Suunto Fused RGBM 2 or Buhlmann 16 GF, selectable by the diver. Modes, gases, algorithm choice, display views and alarms can be configured through the Suunto app or Suunto DM5 software.

The rechargeable lithium-ion battery provides 10 to 20 hours of dive time on a full charge, depending on use. It charges over the included USB cable, and Suunto recommends charging at 0 to +35 degrees C / +32 to +95 degrees F. The computer stores roughly 200 hours of diving or 400 dive logs, which you can offload to the Suunto app over Bluetooth Smart.

The EON Core is offered in Black, White, Lime and Aqua Blue; specifications are the same across colors. It carries a two-year international limited warranty from the date of original retail purchase, extended to five years for failures attributable to the depth measurement (pressure) sensor. Accessories such as chargers, cables, straps and rechargeable batteries carry a one-year warranty period.