Halcyon Symbios HUD Computer

Halcyon Symbios HUD:
A Complete Dive Computer in Your Line of Sight

The Halcyon Symbios HUD is a full-function 5-gas dive computer that can be used independently as a standalone mask-mounted computer, or integrated with other components in the connected Halcyon Symbios ecosystem.

Mounted to the mask frame, the HUD keeps information stable and consistently visible without having to check a wrist-mounted computer. This can reduce task loading during complex dives, gas sharing, bailout, photography, videography, survey work or any situation where hands-free access to data is valuable.

Compact, lightweight, and highly advanced, the Symbios HUD supports open-circuit, fixed or integrated CCR, integrated sidemount, gauge, and buddy-screen functionality. It is suited to recreational, advanced, technical, expedition, rebreather, professional and underwater imaging divers who want important data clearly visible throughout the dive.

Halcyon Symbios HUD at a Glance:

• Smallest and lightest full-feature HUD in the industry
• Full-function dive computer mounted directly on the mask for hands-free, always-visible dive information
• Symbios Wireless Ecosystem – The Symbios Handset can receive wireless data from multiple sources, including Tank Pods, rebreathers, DPVs, GPS buoys, dive lights, and more
• Gradient Factor Chart – Delivers real-time visualization of compartment supersaturation and provides deeper insight into decompression obligations and decompression stress
• Patented Trim Indicator – Provides accurate, real-time feedback on diver trim and body position for optimal underwater efficiency and control (requires a Symbios Tank Pod)
• Patented Trim Indicator – Provides accurate, real-time feedback on diver trim and body position for optimal underwater efficiency and control (requires a Symbios Tank Pod)
• Training Mode – Allows divers to train decompression schedules, precise stop-depth control, and gas-switch procedures in a safe environment without actual decompression obligations
• Full Integration with the Symbios App (Android & iOS)
  • Dive computer setup (settings, gas tables, etc.)
  • Dive simulation
  • Dive data download and logbook
  • Integrated eCCR pre-dive checks
  • Social platform
• Buddy Screen – Displays pO₂ values and tank pressures from your buddy's Symbios eCCR. Particularly valuable for instructors, allowing them to monitor both their own and their students' eCCR data on a single device.
• Full-Color Transflective Screen – Perfectly readable in bright sunlight, even without backlight
• Near-Eye Dive Computer – Mounted directly on the diving mask for hands-free access to critical dive information
• High-Resolution Full-Color Display
• Large Virtual Image – Approximately 30 × 30 cm at a virtual viewing distance of 1 meter for easy readability
• Pre-Programmed Gas Library
• Intuitive Two-Button Operation
• Extensive Customisation – Customisable fields, screens, and functions
• Supports Trimix OC, CCR, and Adjustable Gradient Factors

The Symbios HUD can be used on its own, with the Symbios Handset Dive Computer, with the Symbios Tank Pod, or as part of a Complete Symbios Set consisting of the Handset, Tank Pod and HUD.

You can also purchase the Symbios HUD and Tank Pod Set.

Halcyon Symbios HUD Features & Specifications

• Best Suited For: Divers looking for a compact, hands-free, scalable dive computer within the Symbios ecosystem
• Dive Modes: Multi-gas, open circuit, fixed CCR, integrated CCR, integrated sidemount, gauge and buddy screen
• Number of Gases: 5 OC/CC
• Algorithm: Bühlmann ZHL16-C with adjustable gradient factors
• Screen Resolution: 240 x 240
• Display Type: TFT full-colour micro-display
• Display Size: Virtual image of approximately 20 x 20 cm at 70 cm distance
• Battery Type: Rechargeable Li-ion battery
• Battery Life: Up to 12 hours with five brightness levels
• Dive Log Capacity: 1000 hours at 5-second sampling rate
• Depth Rating: 120 metres
• Air Integration: Optional Symbios Tank Pod with gas pressure monitoring and built-in trim sensor
• Number of Transmitters Supported: Up to 7
• Bluetooth: Yes
• Interface: Two tactile-response buttons
• Compass: 3-axis tilt-compensated digital compass with digital and rose formats
• Firmware Updates: Yes, via the Halcyon app
• Current Languages: English, German, Korean and Chinese
• Mounting: Mask clamp
• Accessories Included: Symbios charging cable
• Dimensions: 68.3 x 62.5 x 36.1 mm

Multi-Gas, Trimix, CCR and Sidemount Capability

The Symbios HUD uses the Bühlmann ZHL16-C algorithm with adjustable gradient factors. It can accommodate up to five gases for open-circuit diving, fixed or integrated CCR, integrated sidemount and gauge modes.

Depth-rated to 120 metres, the HUD operates on a rechargeable Li-ion battery and provides up to 12 hours of runtime across five brightness levels. It can display key dive information including CNS, OTO accumulation, CO2 data where available, gradient factor information and normal maximum average values for the dive.

Large, Clear Near-Eye Display

The Symbios HUD uses a full-colour micro-display to create a large, easy-to-read virtual image in front of the diver. This allows critical information to be read quickly at a glance, without needing to adjust position or shift attention away from the dive.

The display is designed to remain stable and readable while moving, working, filming, handling equipment or managing more demanding dive situations.

Download the Symbios Brochure for more details.

Wireless Technology, CCR Integration and Team Awareness

With advanced Symbios wireless technology, the HUD can receive data from compatible connected sources including the Symbios Tank Pod, rebreathers, DPVs, GPS or positioning systems, trim sensors and other supported Symbios-enabled devices.

• From the Symbios Tank Pod: gas pressure and real-time diver orientation / trim feedback
• From compatible Symbios-connected CCR systems: PO2 values, battery state, CO2, scrubber temperature and other available rebreather data
• From Symbios-enabled products: future-ready integration with supported devices such as GPS pods, DPVs and other connected equipment

The Symbios HUD can also support team awareness by displaying selected buddy or student data where compatible devices are paired. This is particularly useful for instructors, CCR divers and teams operating in demanding or low-visibility environments.

The HUD also provides wireless CCR integration, helping compatible systems display key rebreather data without additional wired connections or dependencies.

The set fulfils all EMC requirements and is FCC- and CE-compliant.

Please note: This listing is for the Symbios HUD only. The Halcyon Tank Pod and Symbios Handset Dive Computer are optional components unless specifically included in a package.

Training, Simulation and Halcyon App Support

Download and register on the Halcyon app to configure your Symbios HUD, manage settings, update firmware, download dive data and access logbook features.

App Store - https://s.mtrbio.com/kaqbvogopq
Play Store - https://s.mtrbio.com/ojpvmugmsl

Device Setup and Customisation
Customise settings, manage gas libraries and adjust screen layouts before entering the water.

Dive Simulation
Use the app to simulate dives, gas switches, decompression schedules and procedures before the dive.

Logbook and Firmware Updates
Download dive data, manage your logbook and keep your Symbios HUD updated as the ecosystem develops.

The Halcyon Symbios Video - A New Ecosystem

Why Choose DirDirect?

• Pioneering Halcyon in the UK: For nearly 25 years, we have been the UK's leading Halcyon dealer, with extensive experience in configuring Halcyon dive systems and technical equipment.
• Extensive Halcyon Inventory: Visit our dedicated technical diving and Halcyon showroom at our physical store to explore one of the UK's largest in-stock selections of world-leading diving products.
• Specialist Equipment Knowledge: Our commitment to Halcyon reflects a shared focus on robust equipment, careful configuration and practical diving experience across recreational, advanced and technical diving.