Are you sailing like a drunken sailor?

The standard legal blood alcohol concentration (BAC) limit for driving and boating is 0.08% in the United States. But not getting enough sleep can lead to similar impairment, according to Galvanic Works which has developed an app to measure crew ability while sailing.

The Galvanic Fatigue Calculator is a free app that estimates how impaired a sailing crew becomes on a multi-day passage and reports it in the one unit everyone already understands: a blood-alcohol equivalent.

Seventeen hours awake produces the same measurable loss of performance as a blood-alcohol concentration of 0.05%. After twenty-four hours it is 0.10%.

The app provides an hour-by-hour fatigue curve for every person aboard, showing when each of them peaks, how the circadian low between 02:00 and 06:00 deepens it, how rough water accelerates it, and what a single extra crew member would change. – Full report