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Mares Sirius L dive computer

Name: Mares Sirius L dive computer
Brand: Mares
SKU: 142905623
Price: 249.49 EUR
Availability: InStock
Rating: 5 (2 reviews)

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2 Reviews

4 Questions

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Features of Mares Sirius L

Product description of Mares Sirius L dive computer

Description summary

The Mares Sirius L dive computer offers a lightweight, powerful, and intuitive diving experience. Featuring a clear LCD display and the trusted Bühlmann algorithm, it provides precise decompression with customizable settings. Multiple dive modes, including Air, Nitrox, Multigas, Freedive, and Bottom Timer, cater to all divers. Enhanced safety is provided by Safety Stop+ and an easy-to-use, two-button interface. Bluetooth connectivity seamlessly syncs dives to the Mares app for logbook tracking and firmware updates. Its watch-style design and user-replaceable battery make it versatile for both underwater adventures and everyday wear

The Sirius L is Mares’ lightweight dive computer, combining performance and simplicity. With a clear LCD display, multiple dive modes, Bluetooth connectivity, and the trusted Bühlmann algorithm, it offers precision and ease in a compact design. Features like Safety Stop+, two-button navigation, and a user-replaceable battery make it ideal for all levels of diving.

Lighter Design. Limitless Performance. The Sirius L, the streamlined evolution of Mares´ high-performance dive computer. Designed for divers who demand power and precision without the extra bulk, the Sirius L combines essential features, intuitive usability, and lightweight comfort.

Connectivity:
- Built-in Bluetooth connects to the Mares app for effortless dive uploads, detailed logbook tracking, and automatic firmware updates.

Watch Style:
- Compact, wearable convenience, combining daily watch functionality with advanced dive monitoring, travel ease, and a stylish, discreet design.

Safety Stop +:
- Safety Stop + offers an optional extended safety stop with countdown timer, promoting safer ascents, reducing decompression stress, and enhancing overall dive safety

User-replaceable Battery:
- User-replaceable batteries allow quick, convenient changes anywhere, keeping your dive computer ready to use.

Features:

- Clear Segment LCD Display: Crisp, easy-to-read data thanks to Chip-on-Glass LCD technology—designed for readability even in challenging underwater conditions.
- Multiple Dive Modes: Air, Nitrox, Multigas Nitrox (up to 3 gases), Freedive, and Bottom Timer modes, with features like Safety Stop and Safety Stop+.
- Safety Stop+ Function: In addition to the standard safety stop, Safety Stop+ monitors your ascent and automatically offers an optional extended stop at shallower depths based on dive profile and ascent rate. It’s not mandatory, but adds an extra layer of safety. Ideal for repetitive or deeper dives.
- Precision Decompression: Powered by the trusted Bühlmann ZH-L16C algorithm with customizable gradient factors and multiple personalization levels to match your training and preferences.
- User-Friendly Interface: Navigate with ease using just two buttons, whether on land or underwater.
- Bluetooth Connectivity: Sync directly with the Mares App or SSI App to access your dive logs, monitor progress, and update firmware effortlessly.
- Long Battery Life: Powered by a user-replaceable CR2450 battery with up to 100 dives per cycle.
- Everyday Versatility: Includes time-of-day functions: day & date, wake-up alarm, and countdown timer. A watch for both diving and daily use.

Glance:
- Dive modes: Air, Nitrox, Multigas Nitrox, Freedive, Bottom Timer
- Bühlmann ZH-L16C algorithm with customizable gradient factors
- Multigas capability: up to 3 gases
- Safety Stop and Safety Stop+ options
- Bottom Timer mode with resettable average depth and stopwatch
- Decompression dive planner with user-adjustable surface interval
- Logbook capacity for up to 100 dives with graphs (via Mares App)
- User-replaceable battery (CR2450) – approx. 100 dives
- Integrated Bluetooth for app sync and firmware updates
- Two-button navigation for intuitive use
- Strap easily replaceable with colour straps or a bungee mount

Specifications:

- Battery type: CR2450
- Battery duration: Approx. 200-300 hours of diving
- Nitrox use: EAN from 21% to 99%
- Max. displayed depth: 100m / 328 ft
- Ascent rate indicator (m/min - ft/min): yes
- Memory capacity: > 200 hrs
- Profile Sampling Rates: 5 s
- Display: Segment Display
- Gas switching: yes
- Stopwatch: yes
- Watch: yes
- Daily Alarm: yes
- Plan Mode: yes
- Choice of Metric / Imperial units: yes
- Fresh and Seawater Settings: yes
- Residual Nitrogen Reset: yes
- Option To Exclude Audible Alarms: yes
- Exclusion of ´´Uncontrolled Ascent´´: yes
- Altitude Adjustment: yes
- Upgradeable software: yes
- Dive Hours per Charge: 200-300 hrs

Specifications

Manual

Technical specifications of Mares Sirius L

Display Type

Segment LCD
Wireless Connectivity

Bluetooth
Battery Life

200-300 Hours Of Diving
Battery Type

CR2450
Water Resistance Rating

100m
Color

Grey
Recommended Use

Diving
Features

User-replaceable battery
Features

Air management
Features

Nitrox compatible

Features of Mares Sirius L

Color Grey

Color

Grey

Recommended Use Diving

Recommended Use

Diving

Features User-replaceable battery

Features

User-replaceable battery

Air management

Nitrox compatible

Key differentiators

Enhanced safety features including Safety Stop+ and an ascent rate indicator.

Integrated Bluetooth for syncing with the Mares app and firmware updates.

Long battery life of 200-300 hours from a user-replaceable CR2450 battery.

Versatile dive modes: Air, Nitrox, Multigas Nitrox, Freedive, and Bottom Timer.

Technology in Mares Sirius L dive computer

Energy rating

Warnings

5 / 5

2 Reviews

What our customers are saying about Mares Sirius L dive computer

Dive computer

2026/08/21

Very good supplement, totally necessary, easy to use, and of excellent quality

Excellent Job

2026/06/03

I decided to go ahead and bought a Marez dive comp despite some bad reviews about DiveInn. I found that the accusations were unfounded. I bought the item on 16 May. and I received it on 3 Jun, about two weeks' time. I think this is a fair amount of delivery lead time for an item like this. Totally satisfied with the service.

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Include AI Generated questions and answers

2026-07-29

Generated by AI and verified

What are the key features of the Mares Sirius L dive computer?

Answer of Generated by AI and verified

The Mares Sirius L is a lightweight dive computer featuring a clear LCD display and multiple dive modes, including Air, Nitrox, Multigas, Freedive, and Bottom Timer. It uses the trusted Bühlmann ZH-L16C algorithm for precise decompression calculations. Key features include Bluetooth connectivity for syncing with the Mares app, a user-replaceable CR2450 battery, and enhanced safety with the Safety Stop+ function.

* Generated by AI based on customer and product data

2026-07-29

Generated by AI and verified

Is the battery on the Mares Sirius L user-replaceable?

Answer of Generated by AI and verified

Yes, the Mares Sirius L features a user-replaceable CR2450 battery. This allows you to easily change the battery yourself, ensuring your dive computer is always ready for your next dive without needing to send it for service.

* Generated by AI based on customer and product data

2026-07-29

Generated by AI and verified

What is the maximum depth rating for the Mares Sirius L?

Answer of Generated by AI and verified

The Mares Sirius L has a maximum depth rating of 100 meters (328 feet), making it suitable for a wide range of recreational and technical diving activities.

* Generated by AI based on customer and product data

2026-07-29

Generated by AI and verified

Can I use the Mares Sirius L for different types of diving, like freediving or with nitrox?

Answer of Generated by AI and verified

Absolutely. The Mares Sirius L is a versatile dive computer equipped with multiple modes to suit various diving disciplines. It includes modes for Air, Nitrox, Multigas Nitrox, Freedive, and a Bottom Timer, making it an excellent choice for divers who participate in different types of underwater activities.

* Generated by AI based on customer and product data

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Frequently bought together

Best sellers

Use cases

Multi-Gas Recreational Diving 100% Fit

This computer is a great all-rounder for recreational divers who use different gas mixes. It supports both standard Air and Nitrox, including multigas switching, making it a versatile and reliable upgrade for exploring various dive sites.

Air, Nitrox, and Multigas Nitrox modes,Bühlmann ZH-L16C algorithm,Gas switching capability,Max depth rating of 100m

Dive Logging and Analysis 90% Fit

For divers who meticulously track their performance, this computer offers robust logging features. With Bluetooth connectivity and a 100-dive logbook, you can easily transfer and analyze your dive profiles on other devices after your trip.

Bluetooth wireless connectivity,100-dive logbook capacity,Upgradeable software,5-second profile sampling rate

Freediving and Apnea Training 80% Fit

This computer offers solid performance for freedivers with its dedicated Freedive mode. It provides essential data for breath-hold diving, while audible alarms and a clear display enhance safety during training and recreational freedives.

Dedicated Freedive mode,Stopwatch function,Audible alarms,Ascent rate indicator

Dive Travel and Varying Conditions 80% Fit

Ideal for the traveling diver, this computer adapts to different environments with settings for both fresh and seawater, plus altitude adjustment. The user-replaceable CR2450 battery ensures you can easily swap it out on a trip without needing special tools or a service center.

Fresh and seawater settings,Altitude adjustment,User-replaceable CR2450 battery,Metric/Imperial unit selection

Best for

Ideal for Tech-Savvy Divers

With Bluetooth for easy data syncing, upgradeable software, and a 100-dive logbook, this computer allows for detailed post-dive analysis and digital logging.

Wireless connectivity: Bluetooth, Logbook capacity: 100 dives, Upgradeable software: yes

Great for Adventurous Hobbyists

Multiple dive modes including Nitrox and Freedive, combined with a reliable Bühlmann algorithm, offer the versatility needed for varied underwater adventures.

Dive modes: ["Air", "Nitrox", "Multigas Nitrox", "Freedive", "Bottom Timer"], Algorithm: Bühlmann ZH-L16C

A Solid Upgrade for Regular Divers

This computer offers a balanced set of features, including gas switching and a 100m depth rating, providing solid performance for those advancing their diving skills.

Gas switching: yes, Max depth rating: 100m / 328 ft, Dive modes: ["Air", "Nitrox", "Multigas Nitrox", "Freedive", "Bottom Timer"]

Reliable for Dive Professionals

Its robust dive modes, user-replaceable battery for minimal downtime, and clear ascent rate indicators make it a trustworthy tool for guiding and instruction.

User replaceable battery: CR2450, Ascent rate indicator: yes, Dive modes: ["Air", "Nitrox", "Multigas Nitrox", "Freedive", "Bottom Timer"]

Benefits

FunctionalSupports a Wide Range of Diving Activities

Accommodates various diving disciplines with multiple modes, including Air, Nitrox, Multigas Nitrox, Freedive, and Bottom Timer. This versatility allows you to use a single device for different types of underwater adventures, making it a great value.

Dive modes: Air

Nitrox

Multigas Nitrox

Freedive

Bottom Timer

FunctionalEasily Sync Your Dive Logs

Equipped with Bluetooth connectivity, this dive computer allows you to wirelessly transfer your dive data to other devices. This makes it simple to log your dives, analyze your profiles, and share your experiences without the need for cables.

Wireless connectivity: Bluetooth

Logbook capacity: 100 dives

FunctionalReplace the Battery Yourself, Anytime

Features a user-replaceable CR2450 battery, eliminating the need for professional service when the power runs low. This convenient design saves you time and money, ensuring your dive computer is always ready for your next dive.

User replaceable battery: CR2450

FunctionalStay Informed with Critical Dive Alerts

Integrated safety features, including an alarm function and an ascent rate indicator, provide crucial alerts during your dive. These functions help you monitor your ascent and other important parameters to support a safer dive experience.

Alarm function: yes

Ascent rate indicator: yes

Ideal buyer profiles

The Tech-Savvy Diving Enthusiast

This diver loves integrating technology into their hobbies. They want a dive computer that not only provides critical safety data but also connects seamlessly with their other devices to log, analyze, and share their underwater adventures.

The Mares Sirius L is an excellent match, featuring Bluetooth connectivity for easy data syncing to other devices. Its software is upgradeable, ensuring it stays current with new features, and it offers a logbook capacity for 100 dives with a memory of over 200 hours, satisfying the need to meticulously track and review every dive.

The Adventurous Hobbyist Diver

This individual dives frequently for recreation and seeks a reliable, feature-rich computer that can support a variety of diving experiences, from simple reef exploration to more advanced dives. They value versatility and safety features that grow with their skills.

With modes for Air, Nitrox, Multigas Nitrox, and Freediving, the Sirius L offers the versatility this diver needs. Key safety features like an ascent rate indicator, audible alarms, and a robust Bühlmann ZH-L16C algorithm provide the peace of mind required for exploring new underwater environments.

The Professional Diver

This user, such as a divemaster or instructor, requires a robust and dependable tool for daily use. Their priorities are reliability, efficiency, and the ability to handle various dive scenarios, including managing multiple gas mixes.

The Sirius L meets professional demands with its multigas Nitrox support and gas switching capabilities. The long battery life of 200-300 dive hours and a user-replaceable battery ensure it's always ready for back-to-back dives. Features like a dive planner and a clear display make it a trustworthy workhorse for any dive professional.

Competitive features

When evaluating the Mares Sirius L Dive Computer against its peers, it's clear that the market for entry-to-mid-range dive computers is highly competitive, with many models offering similar core functionalities at a comparable price point. The primary differentiators often lie in specific dive modes, user interface design, and connectivity features. Our analysis focuses on how the Sirius L's feature set caters to different types of divers compared to alternatives like the Mares Sirius Hunter, Seac Computer Apnea, and Cressi Goa.

Where it excels

The Mares Sirius L stands out with its versatile range of dive modes, including Air, Nitrox, Multigas, Freedive, and a Bottom Timer. This makes it a highly adaptable choice for divers who engage in various types of underwater activities, from simple recreational dives to more technical ones. With built-in Bluetooth connectivity, the Sirius L offers seamless integration with the Mares app. This allows for easy dive log tracking and firmware updates, a modern convenience that appeals to tech-savvy divers who want to manage their dive data digitally. Designed for ease of use, the Sirius L features a simple two-button interface and a clear LCD display. Combined with a user-replaceable battery, it offers a practical and low-maintenance experience, which is particularly beneficial for divers who value simplicity and convenience.

Consider alternatives if...

For divers who are exclusively focused on spearfishing or freediving, a specialized computer like the Mares Sirius Hunter Spearfishing Computer or the Seac Computer Apnea might be a more tailored choice, as their features are specifically optimized for those activities. Divers seeking a minimalist, capsule-only unit to integrate into an existing console might prefer the Scubapro Aladin One Mx Capsule Only, which is designed specifically for that purpose rather than as a standalone wrist unit.

Verdict

The Mares Sirius L Dive Computer is a strong, all-around contender in its price category. It successfully balances a comprehensive feature set—including multiple dive modes and Bluetooth connectivity—with an intuitive, user-friendly design. While specialized divers might find more targeted options, the Sirius L's versatility and modern features make it an excellent choice for a wide range of recreational and enthusiastic divers looking for a capable and reliable companion for their underwater adventures.

Specs comparison

	Mares Sirius L dive computer	Mares Smart Air Dive Computer	Mares Sirius Dive Computer
Alarm Function	yes	true	Yes
Battery Life	200-300 hours of diving	200-300 Dives Over A Three Year Time Span	30 hours
Dive Modes	Air, Nitrox, Multigas Nitrox, Freedive, Bottom Timer	multi-gas dives, freediving mode	Nitrox and trimix capable, up to 5 gases
Max Depth Rating	100m / 328 ft	150m / 492ft	150m / 492ft
User Replaceable Battery	CR2450	True	-
Water Resistance	100m	True	-
Wireless Connectivity	Bluetooth	hoseless air integration for up to three transmitters	Bluetooth
Display Size	Segment Display	<50 mm	high-resolution
Type	wrist	-	watch-style
Battery Type	CR2450	Lithium	Rechargeable

Specs vs competitors

	Mares Sirius L dive computer	Aqualung I300c Dive Computer	Seac Action Hr Dive Computer	Seac Action Dive Computer	H.dessault By C4 Stark Dive Computer	Sherwood Scuba Logic Dive Computer
Alarm Function	yes	yes	MOD exceeded alarm, deco stop violated alarm, ascent speed alarm, NoFly time and desaturation calculations, maximum permitted altitude warning	MOD exceeded alarm, deco stop violated alarm, ascent speed alarm, NoFly time and desaturation calculations, maximum permitted altitude warning	customizable audible and visual alarms	Audible and Visual Alarms - Diver Selectable
Battery Life	200-300 hours of diving	-	user-replaceable	40 hours	CR2450	Replaceable CR2450 Battery
Dive Modes	Air, Nitrox, Multigas Nitrox, Freedive, Bottom Timer	Air, Nitrox, Gauge, Free	SCUBA, GAUGE, FREEDIVING	SCUBA, GAUGE, FREEDIVING	Scuba, Gauge, Freediving	Air, Nitrox, Gauge
Max Depth Rating	100m / 328 ft	100m/330 ft	<50 mm	-	100 Meters	suitable depth rating
User Replaceable Battery	CR2450	yes	true	true	Yes	Yes
Water Resistance	100m	-	Dive Computer	true	100 Meters	-
Wireless Connectivity	Bluetooth	Bluetooth	-	-	-	Wireless Sync
Display Size	Segment Display	Segment	-	LCD	high-contrast LCD	Puck-Style
Type	wrist	-	wrist	wrist-mount	watch-style	puck-style
Battery Type	CR2450	user-changeable battery	CR2450	CR2450	CR2450	Replaceable CR2450 Battery