Suunto Nautic Dive Computer with Bungee Cord and Tank Pod Dive Mount

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.

A dive pod, in this case the Suunto Tank POD, is a wireless pressure transmitter that threads into a high pressure port on your first stage and sends cylinder pressure to your wrist computer over a single channel 123 kHz link. On a liveaboard with several dives a day, it removes a hose from your setup and puts pressure, depth and time on one AMOLED screen, with every dive syncing to the Suunto App afterward.

The Tank POD threads directly into a high pressure port using standard 7/16"-20UNF threading and tightens on a 19 mm hex base. It is 80 mm / 3.15 in long, 40 mm / 1.57 in at its widest point and weighs 95 g / 3.4 oz, and it is rated for a working pressure of 300 bar / 4351 psi. If you are unsure about your first stage port, call 888-701-4017.

Yes. The Suunto Nautic supports dual transmitters, so a second Tank POD can be added for a stage, deco or sidemount cylinder. The computer also supports multi-gas and sidemount configurations along with full decompression planning, so the gas you are breathing and the pressure remaining in each monitored cylinder can be shown on the customizable dive views.

The Tank POD runs on a 3.6 V 1/2 AA primary lithium-thionyl chloride (Li-SOCl2) cell. The Suunto Nautic wrist computer is rechargeable and delivers up to 120 hours of use on a single charge. Keep the Tank POD within its 0 to 40 degrees C / 32 to 104 degrees F operating range in the water, and store it between -20 and +50 degrees C / -4 and +122 degrees F.