Mares Smart Dive Computer

At a glance

Mares Smart Dive Computer is a dive computer from Mares, rated 4.2 out of 5 and placed 29 of 33 in our dive computers shortlist. Its defining number is weight: 79 g (2.8 oz). It scores hardest on packed weight (73/100) and softest on comfort and fit (56/100). The clearest advantage divers report: very affordable entry-level computer.

What the dive computer actually gives you

Where it wins and where it costs you

Full review: Mares Smart Dive Computer

The Mares Smart is a streamlined, entry-level dive computer designed for divers who want reliable performance without unnecessary complexity. Built by Mares, a longstanding name in scuba diving gear, this wrist-mounted computer offers air, nitrox, and gauge modes, making it versatile enough for recreational divers who occasionally dive enriched air blends up to 40 percent oxygen. Its large, easy-to-read display presents essential data clearly underwater, including depth, dive time, no-decompression limits, and ascent rate, all housed in a compact and lightweight case that sits comfortably on the wrist without feeling bulky, even during long surface intervals between dives.

Functionality is centered around simplicity, with a single-button interface that allows divers to navigate menus and settings without fumbling through complicated sequences while gloved or in low visibility. The Mares Smart uses the RGBM algorithm, the same decompression model trusted across much of Mares' computer lineup, providing conservative and safety-focused calculations for repetitive dives. It also includes a deep stop feature, which encourages an extra safety pause during ascent to help reduce microbubble formation, along with visual and audible alarms that alert divers to critical thresholds like rapid ascent rates or approaching no-decompression limits, reinforcing safe diving practices throughout the dive profile.

Beyond its core dive-tracking capabilities, the Mares Smart is praised for its user-friendly logbook function, which stores dive history data that can be reviewed post-dive to track depth profiles, bottom times, and surface intervals. The device is powered by a user-replaceable battery, allowing divers to swap it out themselves without needing to send the unit in for professional service, which adds convenience and reduces downtime between dive trips. Compact, intuitive, and dependable, the Mares Smart suits newer divers stepping up from basic dive tables as well as experienced recreational divers looking for a no-fuss, functional computer that handles the essentials of dive planning and monitoring with straightforward efficiency.