Galvanic Fatigue Calculator

Offshore sailing fatigue model

Free · Designed for iPad. Not verified for macOS.

Biomathematical fatigue modelling for offshore sailing. Plan safer passages with peer-reviewed sleep science. BAC-equivalent, watch schedules, sea state. Galvanic Fatigue Calculator turns peer-reviewed sleep science into a practical passage-planning tool for offshore sailors. Enter your crew size, route, departure time, and pre-departure sleep — the app simulates hour-by-hour fatigue across every watch, expressed as Blood Alcohol Concentration equivalent (BAC%), the standard metric for cognitive impairment in occupational fatigue research. Under the hood, the app runs the McCauley Unified Model (McCauley et al., 2009, 2013; Ramakrishnan et al., 2016) — the same two-process biomathematical engine used in operational fatigue-risk management for aviation, shipping, and the military. It models homeostatic sleep pressure and the slow allostatic lower asymptote with closed-form analytical solutions, and layers circadian modulation on top. Features • Crew sizes 1–4 with auto-generated watch schedules • Route, speed, and duration planning • Sea-state selector: calm, moderate, rough, storm • Real-time fatigue gauge 0–0.20% BAC • Hour-by-hour chart and per-crew breakdown • Compare mode (what happens with one more crew?) • Share results • Languages: English, Spanish, French, German, Italian Free. No third-party ads. No trackers.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, Galvanic Works S.L., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Contact Info
    • Identifiers

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Identifiers
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Galvanic Works S.L.
Size
  • 58 MB
Category
  • Navigation
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPad
    Requires iPadOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
Copyright
  • © 2026 Galvanic Works
  • Developer Website
  • Privacy Policy