Mares

Mares Sirius

A watch-style color computer with 5-transmitter air integration.

Open BLE sync (libdivecomputer)

Syncs wirelessly with third-party apps (Subsurface, Currents, etc.), not just the manufacturer app.

Mares Sirius
4.0Comparison Score
$622.71
Buy on AmazonBuy on Scuba.com
Released2023
Max depth rating150m
AlgorithmBühlmann ZH-L16C with gradient factors and predictive multigas
Air integrationwireless
Wirelessbluetooth
DisplayMIP color high-resolution display
Batteryrechargeable
Digital compassYes
Gas typesair, nitrox, trimix
Gas switches5
CCR capableNo

"Gas switches" is how many different mixes this computer can be programmed to switch between mid-dive, mostly relevant for technical/staged-decompression diving. It doesn't tell you which gas types (air, nitrox, trimix) are supported. See Gas types and the product description above for that.

Pros
  • Hoseless tank integration for up to 5 transmitters with color-coded pressure
  • Full-tilt digital compass with bearing memory
  • Rechargeable battery good for around 30 hours of dive time per charge
Cons
  • Price sits well above Mares's Puck and Quad lines
  • No CCR mode
  • Rechargeable design means planning around charging, unlike coin-cell computers
Diver community sentiment
Mixed opinions

Divers generally like the Sirius's core diving functionality: adoption of the Bühlmann ZH-L16C algorithm (which several note helps NDLs match other brands like Shearwater and Garmin), tissue-loading graphs, an intuitive menu, competitive pricing versus Shearwater or Garmin, and light weight. Recurring complaints center on hardware reliability and Mares' ecosystem choices: multiple independent users report the watch failing to connect to its induction charger, sometimes even after a repair or replacement unit; the aluminum bezel scratches easily; there's no power-off function; and owners of the older Genius computer are frustrated the Sirius requires a new, incompatible transmitter.

Scubaboard: Mares Sirius general impressionsScubaboard: charging connection failuresScubaboard: algorithm praise, transmitter compatibility

Summarized from public forum discussion (Scubaboard, Reddit, and similar), not a survey we ran ourselves. See the linked threads for the original conversations.

The Sirius is Mares’s premium watch-style computer, aimed at divers who want the reflective color screen and full air-integration feature set without stepping up to a technical-diving brand. Nitrox and trimix capable, it covers most recreational and light-tec use cases in one unit.