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AI & Automation
Subsurface
Subsurface logo
AI & Automation

Subsurface

Subsurface is an open-source, cross-platform dive log and planning application designed for scuba divers, freedivers, and snorkelers. Developed by Linus Torvalds and Dirk Hohndel, it serves as a comprehensive digital logbook that allows divers to import, manage, analyze, and share their dive data. The tool connects directly to over 100 dive computers from manufacturers like Suunto, Garmin, Shearwater, and Oceanic, automatically downloading dive profiles including depth, time, temperature, gas mixtures, and decompression information. Subsurface helps divers track their diving history, calculate gas consumption, plan future dives with detailed decompression schedules, and visualize dive profiles through interactive graphs. It supports technical diving with features for multiple gas mixes, rebreather dives, and CCR (Closed Circuit Rebreather) logging. The application is available for Windows, macOS, Linux, iOS, and Android, with cloud synchronization capabilities through Subsurface Cloud for accessing dive logs across devices. Its open-source nature means it's free to use, community-driven, and continuously improved by diving enthusiasts and developers worldwide.

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📊 At a Glance

Pricing
Free
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General Tools

Key Features

Multi-Platform Dive Computer Support

Subsurface supports direct import from over 100 different dive computer models from manufacturers including Suunto, Garmin, Shearwater, Oceanic, Atomic Aquatics, and many others. The software automatically detects connected devices and downloads complete dive profiles with depth, time, temperature, and gas data.

Advanced Dive Planning

Includes comprehensive dive planning tools that calculate decompression schedules based on user-defined parameters like maximum depth, bottom time, gas mixtures (including nitrox and trimix), and ascent rates. The planner supports technical diving with multiple gas switches and complex dive profiles.

Cross-Platform Synchronization

Subsurface Cloud service enables automatic synchronization of dive logs across Windows, macOS, Linux, iOS, and Android devices. Changes made on one device automatically propagate to all others, ensuring your dive log is always current regardless of which device you use.

Comprehensive Data Visualization

Provides interactive graphs of dive profiles with overlays for depth, temperature, tank pressure, and decompression information. Includes statistical analysis tools, dive site mapping integration, and various report formats for analyzing diving patterns and performance over time.

Rebreather and Technical Diving Support

Specialized features for closed-circuit rebreather (CCR) diving including oxygen and diluent gas tracking, setpoint management, and scrubber duration monitoring. Supports complex technical diving scenarios with multiple gas mixes, decompression gases, and detailed equipment configurations.

Open Source and Extensible Architecture

As open-source software, Subsurface's complete source code is publicly available, allowing users to inspect, modify, and contribute to the development. The community-driven model ensures rapid bug fixes, feature additions, and transparency in how data is handled.

Pricing

Free

$0
  • ✓Full access to all dive logging features
  • ✓Support for over 100 dive computer models
  • ✓Cross-platform compatibility (Windows, macOS, Linux, iOS, Android)
  • ✓Unlimited dive log entries
  • ✓Dive planning with decompression calculations
  • ✓Statistical analysis and visualization tools
  • ✓Export capabilities in multiple formats (PDF, CSV, UDDF)
  • ✓Free Subsurface Cloud synchronization
  • ✓Community support through forums and documentation

Use Cases

1

Recreational Dive Log Management

Casual and recreational divers use Subsurface to maintain a digital logbook of their dive experiences. After each dive, they connect their dive computer to download the profile, add photos and notes about marine life sightings, and track their progress over time. The software helps them monitor their diving frequency, depth records, and improve their skills by analyzing past dives. This replaces paper logbooks with a searchable, organized digital record that's easy to share with dive buddies and instructors.

2

Technical Dive Planning and Execution

Technical divers planning complex dives with decompression obligations use Subsurface's planning tools to calculate gas requirements, decompression schedules, and contingency plans. They can model different gas mixtures (including trimix and heliox), plan multiple gas switches, and set custom conservatism factors. During the dive, they can compare actual profiles against the plan, and afterwards analyze any deviations to improve future dive planning and execution.

3

Dive Instructor and Guide Logging

Professional dive instructors and guides use Subsurface to log student dives, track certification progress, and maintain records for liability and insurance purposes. They can quickly generate reports for certification agencies, share dive profiles with students for debriefing, and maintain organized records of all guided dives. The multi-device sync allows them to update logs from mobile devices immediately after dives while still having full access on their office computers.

4

Scientific Diving Data Collection

Marine researchers and scientific divers use Subsurface to collect and analyze dive data for research projects. They can tag dives with specific research codes, export data in CSV format for statistical analysis, and correlate dive profiles with environmental observations. The ability to handle complex dive profiles and multiple data streams makes it suitable for documenting research dives that may involve unusual profiles or specialized equipment configurations.

5

Dive Travel Planning and Documentation

Divers planning dive trips use Subsurface to research dive sites, plan dive sequences for multi-day liveaboard trips, and document their travel experiences. They can geotag dive sites, add photos from different locations, and create trip summaries to share with friends and fellow divers. The cloud synchronization ensures they have access to their complete dive history while traveling, even if switching between different devices during the trip.

6

Equipment Testing and Performance Monitoring

Dive professionals and equipment enthusiasts use Subsurface to monitor the performance of different dive computers and equipment configurations. By comparing data from multiple devices on the same dives, they can identify discrepancies, calibrate equipment, and make informed decisions about gear purchases and maintenance schedules. The detailed gas consumption tracking helps optimize breathing techniques and equipment setup for better efficiency.

How to Use

  1. Step 1: Download and install Subsurface from the official website (subsurface-divelog.org) for your operating system (Windows, macOS, Linux) or mobile app store for iOS/Android devices.
  2. Step 2: Connect your dive computer to your computer via USB cable, Bluetooth, or infrared connection, depending on your device's capabilities and supported protocols.
  3. Step 3: Use the import function in Subsurface to download dive data from your dive computer. The software automatically detects connected devices and retrieves dive profiles, including depth, time, temperature, and gas information.
  4. Step 4: Review and edit dive details in the logbook interface. You can add notes, photos, dive buddies, locations, and correct any automatically imported data that needs adjustment.
  5. Step 5: Use the planning tab to create new dive plans by setting parameters like maximum depth, bottom time, gas mixtures (including nitrox and trimix), and ascent rates to generate decompression schedules.
  6. Step 6: Analyze dive statistics through various visualization tools, including profile graphs, dive site maps, and summary reports that show trends in your diving history.
  7. Step 7: Share dive logs by exporting them in various formats (PDF, CSV, UDDF) or syncing to Subsurface Cloud for access across multiple devices and sharing with dive buddies.
  8. Step 8: Regularly back up your dive log database and consider using the cloud synchronization feature to maintain access to your complete diving history from any device.

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