# Galvanic Fatigue Calculator — Offshore sailing fatigue model

> Offshore sailing fatigue model (iPhone/iPad app by PIERO ZUCCHELLI.)

- Source: https://appshunter.io/ios/app/galvanic-fatigue-calculator/id6759550165 (this page in markdown: same URL + `.md`)
- Developer: [PIERO ZUCCHELLI](https://appshunter.io/developer/1874253171)
- Category: Navigation, Health & Fitness
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 55 MB
- Languages: American English
- Released: 2026-08-27
- Data updated: 2026-08-31
- User reviews in markdown: https://appshunter.io/ios/app/galvanic-fatigue-calculator/id6759550165/reviews.md

## What is Galvanic Fatigue Calculator?

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.


## Version history (last 1 release)

### 1.0.2 — 2026-08-27

No release notes.

## Related topics

[galvanic fatigue calculator](https://appshunter.io/ios/topics/galvanic-fatigue-calculator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*